Is there life on Europa? We take a look at Greenland and Antarctica to find out more about life on Jupiter’s icy moon.

Further reading:

Life on Venus claim faces strongest challenge yet

Stanford researchers’ explanation for formation of abundant features on Europa bodes well for search for extraterrestrial life 

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

Today we’re going to learn about the potential of life on Europa, a moon of Jupiter! To do that we’ll need to look at some extreme life on Earth too.

Back in September 2020, we talked about potential signs of life in the atmosphere of Venus, which excited me a whole lot. As a follow-up to that episode, further studies suggest that signs of phosphine detected in Venus’s atmosphere, which might be produced by life, may actually just be sulfur dioxide (not a sign of life). But while it’s not looking likely that phosphine is actually found in Venus’s atmosphere, so far no studies can completely rule it out. So, maybe.

Venus isn’t the only part of our solar system where life might exist outside of Earth, though. Astronomers have been speculating about Europa for a long time. The planet Jupiter is a gas giant that has at least 80 moons, but Europa is the one that’s closest to the planet. It’s only a little bit smaller than our own moon.

Europa has an atmosphere, mostly made up of oxygen but so thin that if you could magically appear on the moon, you wouldn’t be able to breathe. Also, you would freeze to death almost immediately. It’s a dense moon, so astronomers think it’s probably mostly made up of silicate rock, which is what Earth is mostly made up of, along with Mars, Venus, Mercury, and a lot of moons.

If you’ve ever looked at our moon through a telescope or binoculars, you know it has lots of impact craters on its surface caused by asteroid strikes in the past. Europa doesn’t have very many craters—in fact, its surface is incredibly smooth except for what look like cracks all over it. It’s mostly pale in color, but the cracks are reddish-orange or brown.

The cause of the cracks has been a mystery ever since astronomers got the first good look at Europa. Many astronomers think these cracks are where warm material from below the surface erupted through the crust, sort of like what happens where lava oozes up on Earth and forms oceanic ridges. But on Europa, the material breaking through the crust isn’t lava, it’s ice—but ice that isn’t as cold as the surface ice. You know you’re on a cold, cold moon when ice that’s close to freezing instead of way below freezing can act like lava. The surface of Europa is about 110 kelvin at the equator and even colder at the poles. That’s -260 F or -160 C.

The exciting thing is that researchers are pretty sure the surface of Europa is icy but that the crust lies over a deep saltwater ocean that covers the entire moon. Yes, an ocean! As Europa orbits Jupiter, the planet’s gravity pulls at the moon, while the smaller gravity fields of the other nearest moons also pull on Europa in other directions. This push and pull causes tides that help warm the ocean and keep it from freezing solid. The brown coloration in the moon’s cracks may be due to mineral salts from the water that get leached up through the cracks after warm ice breaks through, assuming that’s what is actually happening to cause the cracks. Astronomers even have images of Europa taken by space probes that show what look like water plumes erupting through the surface and shooting up an estimated 120 miles high, or 200 km.

But new studies suggest that the water plumes might not be from the ocean. They might be from pockets of water that form within the crust itself, which grow larger until they burst out through the crust. This is even more exciting when it comes to potential life on the moon, because it suggests that the crust isn’t just a big block of ice. It’s a dynamic system that might harbor life instead of all potential life on Europa being restricted to the ocean. But to learn more about Europa, we have to come back to Earth and examine the island of Greenland.

Most of Greenland is covered with a permanent ice sheet like the ones found in Antarctica, but it’s a lot easier to study than Antarctica. One feature seen in the ice sheet is something called a double ridge, shaped sort of like a capital letter M. It’s caused when the ice fractures around pressurized water that forms inside the ice sheet and refreezes. This is caused when water from streams and lakes on the surface finds its way into the ice. The double ridge can look like a crack. New pictures of the cracks on Europa’s surface look just like Greenland’s double ridges, but much bigger.

My explanation of all this is extremely clumsy, because this is a really complex mechanism. Researchers only figured it out because some of the team had been studying Greenland’s double ridges for a completely different project, and noticed the similarities. There’s a link in the show notes to an article about this phenomenon if you want to learn more.

The Greenland ice sheet is over a mile thick. In 1966, the U.S. Army drilled into the ice to see what was under it, and the answer is dirt, as you might have expected. They took a 15-foot, or 4.5 meter, core sample and stuck it in a freezer, where everyone promptly forgot about it for 51 years. At some point it ended up in Denmark, where someone noticed it in 2017.

In 2019, the frozen core sample was finally studied by scientists. They expected to find mostly sand and rock. Instead, it was full of beautifully fossilized leaves and other plant material.

The main reason scientists were so surprised to find leaves and soil instead of just rock is that ice is really heavy, and it moves—slowly, but a mile-thick sheet of ice cannot be stopped. If you listened to the recent episode in the main feed about the rewilding of Scotland, you may remember that Scotland doesn’t have a lot of fossils from the Pleistocene because it was covered in glaciers that scoured the soil and everything in it down to bedrock, destroying everything in its path. But this hasn’t happened in Greenland, even though the sample was taken from an area only about 800 miles, or 1,290 km, from the North Pole.

Where the ice sheet now is, there used to be a forest. Obviously, the ice sheet hasn’t always covered Greenland. Research is ongoing, but a study of the sediment published in 2021 indicates that Greenland was ice free within the last million years, and possibly as recently as a few hundred thousand years.

All this is interesting, but it’s very different from Europa, whose ice sheets have probably been in place almost from the moon’s formation. What kind of life can live on, in, or under ice sheets?

On Earth, at least, a lot of organisms live on glaciers. Most are tiny or microscopic, including a type of algae that grows on top of ice, bacteria that live pretty much everywhere, including inside ice crystals, and microbes of various kinds. But there are some larger organisms, including glacial copepods, snow fleas, glacial midges, and the ice worms we talked about in episode 185 that live on glaciers in the Pacific Northwest.

Most likely, life on Europa will be tiny too. Researchers hypothesize that there could be microbial life living deep within the ice or in the pockets of melted water that develop inside it. There might be microbial mats or algae-type organisms that live on the underside of the ice, anchored there but able to extract nutrients from the ocean water.

But obviously, Europa’s ocean is where most life will probably be found, assuming it’s there. While there’s no environment quite like Europa’s to be found on Earth, since Earth is so close to the sun and nice and warm in comparison, parts of the deep sea are somewhat similar. Lots of animals live around hydrothermal vents, where volcanic activity breaks through the ocean floor and superheats water in small areas. Invertebrates of all kinds have adapted to live between boiling hot water and frigid deep-sea water, where absolutely no sunlight has ever reached. Animals like giant tube worms can grow nearly 10 feet long, or 3 meters, and don’t actually eat anything. Instead, they have symbiotic bacteria that provide them with all the nutrients they need while in turn, the bacteria get a safe place to live.

When the intensely heated, mineral-rich water of a hydrothermal vent comes in contact with cold water, it causes all sorts of chemical reactions. That’s what fuels most of the life around the vents. There are even some fish that live around hydrothermal vents, including the cutthroat eel that can grow over 5 feet long, or 1.6 meters. They’re bottom-dwelling deep-sea eels that live worldwide, but they spend time around hydrothermal vents to eat some of the other animals that live there exclusively. There’s even a type of bacteria found at one vent off the coast of Mexico that uses the faint light emitted by lava deep within the vent for photosynthesis. All other known photosynthesizing organisms use the sun as a light source.

Scientists think that Europa has hydrothermal vents similar to the ones on Earth. Since at least some researchers think life on Earth got its start around hydrothermal vents, it wouldn’t be surprising if life forms also live around Europa’s vents. But that doesn’t mean that life could only live around the vents.

In 2018, a team of scientists in Antarctica bored through the ice sheet and took a sample from the sea floor far below the ice to see if anything lived there. Since this was in the middle of the ice sheet with absolutely no sunlight or open ocean within a million square kilometers, they didn’t expect to find much. When they gave the sample to marine biologist David Barnes to examine, and he got a first look at it, initially he actually thought they’d pulled a practical joke on him. There was no way this one small sample could contain evidence of so much life in such an extreme environment.

He counted 77 different species of organism in the sample. There were worms, bryozoans, sponges, even fragments of jellyfish, and of course there were lots and lots of microorganisms. All the animals were small, which isn’t surprising. That they were there at all was the truly surprising thing.

We don’t know yet if life exists anywhere outside of Earth. Odds are good that it does, just because there are so many planets and moons around so many stars throughout our galaxy and all the other galaxies in the universe. Whether we’ll ever find it is another thing. Until we do, though, we will just have to appreciate all the amazing diversity of life on our own planet, and keep watching the night skies and wondering.

Thanks for your support, and thanks for listening!

It’s Albert the Albanerpetontid!

Further reading:

Earliest example of a rapid-fire tongue found in ‘weird and wonderful’ extinct amphibians

Amphibian skullllll:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

Let’s learn about a long-extinct amphibian that looked a lot like a reptile. It’s a family of animals called Albanerpetontidae. That’s a mouthful, so instead of talking about Albanerpetontids, I’ll talk about all the various species as though they were not only a single species, but a single individual named Albert.

Albert first appears in the middle Jurassic, around 165 million years ago, and disappears from the fossil record around 2 million years ago. That means it survived the extinction event that killed off the non-avian dinosaurs and many other animals, which is also true for many other amphibians. But Albert wasn’t like the amphibians we have around today. It belonged to its own order, Allocaudata.

There’s a lot of confusion in general as to how amphibians are related to each other and how closely related, for instance, the frogs and the salamanders actually are. The same is true for Albert. What we do know is that Albert was definitely an amphibian, but it was also really different in many respects from modern amphibians.

That’s weird, because only two million years ago Albert was still around and seems to have been fairly common. Albert fossils have been found in Europe, North America, northern Africa, and parts of Asia. Two million years isn’t all that long when you’re talking about big differences between related animal groups. But although Albert appears in the fossil record at about the same time as other amphibians, it seems to have evolved very differently in many ways.

Albert looked like a salamander and was originally classified as a salamander. It was small, its body was slender and elongated, its legs were short, and it had a long tail. It had tiny teeth and seemed to prefer wet environments, which makes sense when you’re talking about an amphibian. But Albert had a lot of traits not found in other amphibians, such as scales. The scales were more fish-like than reptilian and were embedded in Albert’s skin like osteoderms, especially concentrated on the head.

These scales have caused confusion for a whole lot of scientists. In 2016, for instance, scientists identified an unusual lizard found fossilized in amber as a 99-million-year-old chameleon. That’s because it had a weird bone in its jaw shaped like a little rod, which looked like a bone found in the modern chameleon’s tongue.

It turns out that the lizard was no lizard at all but our friend Albert, an amphibian. The chameleon is a reptile and not related to Albert, but they share the same type of elongated tongue bone. When the skull of a second amber specimen was discovered that was even better preserved, including a tongue pad and other soft tissue, scientists were able to evaluate whether Albert used its tongue the same way that a chameleon does.

One trait found in Albert skulls that scientists had long been confused about was how robust and large its skull was. Some scientists suggested that it used its big head to dig burrows, ramming its head into soft mud until it created a hole big enough to hide in. But it also had big eyes, which isn’t typical in an animal that burrows.

Scientists now think that Albert’s head was so strong because it needed to withstand the forces of its own tongue. It could probably shoot its tongue out incredibly fast like a chameleon, much faster even than a frog. It’s referred to as a projectile tongue, ballistic tongue, rapid-fire tongue, or boomerang tongue. The muscles that power a chameleon’s tongue are specialized to store energy when it contracts, then launch the tongue out like someone releasing a stretched-out rubber band. Albert’s similar ability evolved separately from the chameleon’s, and much earlier.

It’s also possible that Albert didn’t undergo a larval stage the way most other amphibians do. Juvenile specimens look like miniature adults, which is unusual in amphibians but ordinary in reptiles. Albert also had lizard-like claws. But we know Albert wasn’t a reptile, and in fact it may have demonstrated one of the most amphibian traits known, breathing through its skin. Many modern salamanders don’t have lungs or gills at all as adults, and instead absorb oxygen directly through the skin, called cutaneous respiration. The specialized bone in Albert’s jaw would have made it hard to breathe in the ordinary way, and we know it didn’t have gills.

The big question is why Albert went extinct when other amphibians are doing just fine. We don’t have an answer for that, or not yet. While Albert did seem to be quite successful, fossils of tiny, delicate animals like two-centimeter-long amphibians are rare, and that means we don’t have the full picture of what happened two million years ago that drove Albert to extinction.

For that matter, some scientists wonder if Albert might not actually be extinct. It might be alive and well in remote rain forests, spending most of its time hidden in damp leaf litter and using its mighty tongue to catch tiny insects. Maybe one day a scientist will turn over a log and make the find of a lifetime.

Thanks for your support, and thanks for listening!

Further reading:

Identifying the beasts in Caesar’s forest

Reindeer:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

After the glaciers retreated from Europe at the end of the last ice age, around 11,000 years ago, forests grew wherever there was enough soil to support a tree. As these new forests spread, they joined forests that had survived the glaciations. By the time ancient Romans were writing about the things they encountered while exploring western Europe, around 2,000 years ago, the forest stretched across much of the continent and was considered a wild, dangerous place. They called it the Hercynian [her-SIN-ian] forest and it was supposed to be full of peculiar animals.

An account of the forest appears in the book Commentarii del Bello Gallico, the first edition of which was published just over 2,000 years ago in 49 BCE. It was written by Julius Caesar, or at least he was involved in it even if he didn’t actually write it personally, since it was about his military campaigns. In one section of the book he discusses the Hercynian forest and three remarkable animals that lived in it.

The first was called the uri, which were supposed to look like bulls but were almost the size of elephants, and were incredibly aggressive. This is probably the same animal often called the aurochs, which we talked about in episode 58. The aurochs was probably the wild ancestor of the domesticated cow and could stand almost six feet tall at the shoulder, or 1.8 meters. It had already gone extinct in most places 500 years before Caesar wrote his book, but it still lived in parts of Europe.

The second animal is a lot harder to identify. The alces looked like a big goat that either didn’t have horns or had very short ones, but its legs didn’t have joints. If an alces fell over, it couldn’t get up again. Caesar explained that hunters used this to their advantage. Because the alces couldn’t lie down at night, it would sleep by propping itself against a tree. The hunters would note which tree an alces preferred, and during the day they’d cut a notch in the trunk. When the alces leaned against it at night to sleep, the tree would topple over, taking the animal with it. The waiting hunters would then be able to just stroll up and kill the alces.

Naturally, this story doesn’t make any sense. All tetrapods have jointed legs. But the story of an animal without joints in its legs crops up in various stories from around this time, including the part where hunters cut a notch in a tree trunk to knock the animal over. It’s a story once told about the elephant and the Eurasian elk, among others, and the alces was probably based on the Eurasian elk. That’s the Eurasian population of the animal called the moose in North America. Because the story specifies that the alces either didn’t have horns or had very small ones, it’s possible that Caesar based his story on the female elk, which doesn’t have antlers.

Incidentally, we’re so certain that the alces was the same animal as the Eurasian elk that its scientific name is actually Alces alces.

Finally, the Hercynian deer was likewise large and had a single horn. A translation of the passage states: “There is an ox with the shape of a deer; projecting out of its forehead, in the middle, between the ears, is a single horn, which is both longer and more upright than those horns we are used to seeing.” Other sources that talk about this animal also say that the horn branched at the end, and Caesar notes that both males and females had these horns.

This gives us a big clue as to what animal might have inspired the account. Unlike most deer, both male and female reindeer have antlers. Unlike caribou, the North American reindeer species, the European reindeer often has relatively long and straight main shafts on its antlers that then enlarge at the end in what’s called a palmate structure. That basically means it’s shaped like a hand.

But reindeer have two antlers, not one. It’s possible that the story of the Hercynian deer was inspired by the unicorn legend, which was based on the rhinoceros. It might also have been inspired by Caesar sighting a reindeer that had dropped one antler but hadn’t yet lost the other one, since like other deer, reindeer shed their antlers and regrow them every year.

The reason Caesar wrote about the animals of the Hercynian forest in the first place was to underline how strange and uncivilized the people living in the area were. The people in question are what today we would call Germans. Caesar stresses that all these animals are ones never seen anywhere else, and he might easily have added exotic details from other fabulous animals to make these animals seem extra weird.

These days most of the Hercynian forest is long gone, chopped down for people to turn into farmland and towns. While the Eurasian elk and the reindeer are still around, they no longer live as far south as Germany. The last aurochs went extinct in 1627 in Poland. But the German people are doing just fine, and they’re a lot more civilized than Caesar gave them credit for 2,000 years ago.

Thanks for your support, and thanks for listening!

This week let’s look at the work of a really astonishing number of spiders!

Further reading:

Megaweb!

Some of the webs:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

Baltimore, Maryland is a city in the northeastern United States, in North America, with a population of 2.8 million people. In 1993 a new wastewater treatment plant was built called the Back River Wastewater Treatment Plant, which filters water through big sand beds to trap any particles remaining in it after it’s been filtered and treated in other facilities. The plant consists of 48 big sand beds with a corridor down the middle, and in order to keep the sand beds as clean as possible, the whole area has a big metal roof over it held up with steel columns. It doesn’t have walls, though, just a roof. The whole thing covers four acres, or 1.6 hectares, which I think is a metric term. It’s just over 16,000 square meters. It’s big, in other words, and the roof is pretty tall, up to 24 feet high over the walkway, or 7.5 meters.

Obviously, I’m telling you about this place in detail because of an animal that got into the water treatment plant and caused a lot of alarm. It wasn’t a big animal like a bear, though. It wasn’t even a dangerous animal. It was, in fact, a really small animal that’s mostly harmless to humans, various species of orbweaver spider. The problem wasn’t the spider itself but just how many spiders were in the water treatment plant.

The plant had always had problems with lots of orbweavers, but in 2009 there were so many spiders that the workers were worried for their safety. In late October 2009, the managers called for help about “an extreme spider situation.” The problem was way beyond anything that an ordinary pest control business could deal with, so the city put together a team of arachnologists, entomologists, and experts in urban pest control to figure out the best course of action.

The team didn’t just charge in, say, “Wow, that’s a lot of spiders, let’s hose the whole place down.” They were scientists and studied the situation methodically. They consulted the architectural plans of the plant to determine just how much volume was available under the roof, they took samples of the webs and stored them for study, they took over 300 photos, and basically they got as much data as they could.

There were so many spiders that their webs blended together into thick mats that filled almost every space the spiders could reach. These cobweb mats were attached to the rafters, the walkways, everywhere, with the older mats starting to detach and fray. Light fixtures hung down from the tallest point of the roof that were 8 feet long, or 2.44 meters, and there were so many webs attached to them that they were pulled out of alignment. And all the webs were filled with spiders.

The spiders in the web samples were removed and preserved, then examined to see what species they belonged to. The team identified specimens from nine genera in six families, but most of the spiders caught were the species Tetragnatha guatemalensis. This is a type of long-jawed orbweaver native to North and Central America. Females are much larger than males, with a legspan up to 2 inches across, or about 5 cm. Long-jawed orbweavers have long, thin bodies, and one of the ways it hides is by stretching out on a blade of grass or a twig with its legs out straight. It especially likes marshy areas, such as in the rafters above 48 giant sand beds full of water.

A conservative estimate of the number of spiders in the Back River Wastewater Treatment Plant in the first week of November, 2009 was 107 million. 107 million spiders! Since a big percentage of the spiders were newly hatched, there were probably a lot more in the facility than the scientists estimated from the samples they took, so there might easily have been several hundred million spiders total. The sheets of webbing in the ceiling covered an estimated 2 acres total, or about 8,000 square meters, while the cloud-like masses of webbing in other areas was about half that size and would have filled 23 railroad boxcars.

The really interesting thing is that orbweaver spiders are usually solitary. Spiders may build webs near each other, but not usually like this. But these orbweavers lived in a place protected from wind and weather, and close to water, which attracted lots of midges and other small insects, and the presence of humans probably kept a lot of potential spider predators away, like birds. Life was good for these spiders and the scientists observed that they weren’t acting aggressively to each other, even when they were of different species.

After studying the water treatment plant and its spiders, the team came to several conclusions. Since the spiders are harmless to humans, and are doing a really good job controlling the midge population, the scientists decided that pest control was not necessary and would even be a bad idea since the pesticides would inevitably get into the water. Instead, they recommended that web removal be implemented as a normal course of action when the webs started building up too much. They even suggested that the workers should be proud of their record-breaking webs, and that the plant was an ideal site for scientists to study the spiders in detail.

Thanks for your support, and thanks for listening!

DRAMA! Bird drama! Here are some further-reading links if you want to verify that I’m not vilifying anyone:

Buff-breasted Buttonquail: An image claimed to be of this species revealed

Buff-breasted Buttonquail: Smoke & Mirrors

A review of specimens of Buff-breasted Button-quail Turnix olivii suggests serious concern for its conservation outlook

A painted button quail:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

Back in episode 136 we talked about the button quail, because that episode was about tiny animals and the button quail is really tiny. But let’s revisit the button quail this month, because we have a mystery associated with a particular species of button quail.

Button quails generally live in grasslands and are actually more closely related to shore and ocean birds like sandpipers and gulls than to actual quails, but it’s not very closely related to any other living birds. It can fly but it mostly doesn’t. Instead it depends on its coloring to hide it in the grass where it lives. It’s mostly brown with darker and lighter speckled markings, relatively large feet, and a short little tail. It eats seeds and insects along with other small invertebrates.

The button quail is especially interesting because the female is more brightly colored than the male, although not by much. In some species the female may have bright white markings, while in others her speckled markings are crisper than the males. The female is the one who calls to attract a male and who defends her territory from other females. The female even has a special bulb in her throat that she can inflate to make a loud booming call.

The male incubates the eggs and takes care of the chicks when they hatch. Baby button quails are fuzzy and active like domestic chicken babies but they’re only about the size of a bumblebee. In many species, as soon as the female has laid her eggs, she leaves them and the male and goes on to attract another male for her next clutch of eggs.

The various species of button quail live in different areas, including Africa, Asia, and Australia. The species we’re talking about today is the buff-breasted button quail, which is native to one small area of Queensland, Australia. It grows about 9 inches long, or 23 cm, which is big for a button quail, most of which are closer to the size of sparrows, and it’s reddish-brown with darker and lighter speckles. It’s critically endangered due to habitat loss and introduced animals like cats and cattle. There are only an estimated 50 individuals alive today.

But that’s only an estimate, because no one has actually for sure seen a buff-breasted button quail since 1922. Also, I’m going to call it the BBBQ from now on because that name is hard to say.

The 1922 specimen was shot by a naturalist who was collecting specimens for a museum, which was regrettably common at the time and led to a lot of endangered species being driven to extinction. The bird was already rare in 1922 and that was the last anyone saw of it until 1985, when someone reported seeing one. People flocked to the area in hopes of spotting it, but while there were lots of sightings, no one got a good picture of a BBBQ. All the pictures, and all the recordings of its calls, turned out to be of another species of button quail, a very similar bird called the painted button quail.

It’s been 100 years since the bird was last seen, so while we have lots of museum specimens, we don’t have any modern sightings. That means two things. Either the buff-breasted button quail is probably extinct…or it never actually existed in the first place.

There are two other species of button quail that live in the same areas where the BBBQ is found, the painted button quail and the brown quail. They’re smaller but otherwise look very similar, especially the painted button quail. Maybe people were mistaking larger individuals of painted button quails as a different species.

In 2018, a team of scientists from the University of Queensland conducted a search for the BBBQ. All they found were painted button quails. But they discovered something surprising that had never been documented before. During the breeding season, the female painted button quail’s feathers are much more reddish-brown, while the rest of the year the feathers on her back are more gray-brown.

The team also studied as many BBBQ skins as they could track down from museums, where they learned something else surprising. It turns out that it’s not any larger than the painted button quail, which grows up to 8 inches long, or 20 cm. So the birds are the same size and during part of the year, they have almost identical plumage. Hmm.

That doesn’t mean the buff-breasted button quail never existed. One very distinctive difference between the painted and the buff-breasted species is eye color, with the former having red eyes and the latter having yellow. As far as I know a genetic study hasn’t been carried out on the museum specimens, but it’s likely that at least some of the specimens—maybe all of them—really are BBBQs. Scientists and bird enthusiasts are still looking for the bird, and that has led to a strange controversy.

In early 2022, a naturalist named John Young published a photo on Facebook of what he said was a male buff-breasted button quail on a nest, a photo taken by a camera trap in a secret location. The location had to be secret so that no one would try to find the birds and scare them away or damage a nest. Young said he had 16 other photos of BBBQs but wasn’t going to share them until he was ready to publish his findings. He was also raising money to continue his studies at the site.

Another naturalist thought there was something fishy about the photo. He discovered that the picture is actually a cropped and flipped photo of a painted button quail bird and nest reportedly taken at a different site—published in 2018 by John Young himself and labeled by him as a painted button quail. Young had reused one of his own photos and assumed no one would notice.

But it gets worse. Back in 2013, Young got photographs of another extremely rare Australian bird, the night parrot. One day we’ll have an episode about it. It was such a big deal that he was offered a job by the Australian Wildlife Conservancy, or AWC, to study the night parrot and the buff-breasted button quail. He documented sightings and produced photos of both birds, but he didn’t stay in that job too long. That’s because some people started getting suspicious of his parrot photos. After an inquiry into the night parrot photos, the AWC concluded that the eggs in a photo of a night parrot nest were probably fake.

And Young’s dubious photos go back even farther. In 2006 he claimed to have discovered a new species of parrot in Queensland, but while initially the Queensland government supported learning about the new species, it withdrew its support when the photo turned out to be…suspicious. It looked like Young had altered the coloration of a bird to make it look like a new species. When an expert requested the original photographs, Young said he’d deleted them.

More recently, the 2018 painted button quail photo and the supposed 2022 BBBQ photo were examined by a forensic photography expert. Young had removed the metadata from both so no one could tell where they were taken, but there’s a little white stone in both pictures that’s identical, along with many other identical details.

The problem with fake sightings and photographs is that it’s actually making things worse for the buff-breasted button quail. The AWC and other conservation groups are trying to get the bird listed as endangered, which means funding for research and conservation. Now all that is in jeopardy because it’s not clear if there have actually been any sightings of the bird at all.

Hopefully the buff-breasted button quail is still around and someone will get genuine photos of it soon so it can be protected and studied. That’s assuming it’s a real bird in the first place.

Thanks for your support, and thanks for listening!

This week let’s learn about some blue frogs!

Further reading:

Scientists make chance discovery of rare blue skin mutation in Kimberley magnificent tree frog

White’s True-Blue Green Tree Frog

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

When most of us draw a frog, we reach for the green markers, because most frogs are green. That’s true of the magnificent tree frog, also called the splendid tree frog, which is fairly common in the Kimberley region of western Australia. It grows just over 4 inches long, snout to vent, or about 10 and a half cm, and lives in rocky areas. It spends the day hiding in rock crevices, holes in trees, or sometimes in people’s houses, and it comes out at night to hunt for insects and other small invertebrates.

From the name, you might imagine that this is an especially pretty frog, and it is. It’s mostly bright green on top and yellow to white underneath, and it has tiny yellow spots on its head and back. It looks like it has an olive green cap on its head, but that’s actually a large parotoid gland, a skin gland common in frogs and toads that secretes neurotoxins. Most frogs don’t have a parotoid gland at all, and in ones that do you typically will barely notice it, but the magnificent tree frog’s covers the entire top of its head almost to its nostrils and down onto its back.

The skin color of a frog depends on its chemical makeup. Melanophores make black and brown colors, xanthophores make yellow. Blue is different, since it’s not a color that’s actually found in skin pigments. Instead, a green frog’s skin contains iridophores that reflect blue light waves, the same way a bird’s feathers show blue. The combination of yellow and blue makes green, and the addition of melanophore pigments determine how dark or bright the green is.

In July of 2024, two land managers were working in the Charnley River-Artesian Range Wildlife Sanctuary. They were in a workshop when one of them noticed a magnificent tree frog sitting on a bench, not that unusual of an occurrence–except that this frog wasn’t green. It was blue!

The condition is called axanthism, where the yellow pigments in the frog’s skin don’t show up the way they should. Most of them time axanthism in frogs means the animal has little patches of blue or bluish coloration, but this specific frog was blue just about everywhere it should have been green. Its parotoid gland was still olive green and it had yellow on its feet, but mainly it was a very attractive dark blue.

The land managers were stunned. They took photos and sent them to pretty much everyone, and frog experts and ecologists hurried to examine the blue frog. But they decided not to keep the frog in captivity. It was released back into the wild to live out its blue froggy life normally.

Some frogs are naturally blue, like some poison dart frogs of South America. The blue poison dart frog’s legs are dark blue and its body a lighter blue with black spots. It grows less than two inches long, or about 4.5 cm. Poison dart frogs collect toxins in their bodies from some of the toxic insects they eat, and the bright coloration signals to predators that this frog will make you really sick if you eat it.

Axanthism is rare but not all that uncommon in frogs. About the same time that the blue magnificent tree frog was hopping into the workshop in Australia, two little girls playing around a pond in Nova Scotia, Canada found a teal-blue frog. Ironically, the frog is actually called the green frog and it’s ordinarily a dark olive-green all over. The girls named the frog Bluey and released it back into the pond. Another blue green frog was found in New Hampshire, in the United States, also in July 2024. In June 2024 a forest ranger spotted a northern leopard frog in Washington state that had splotches of light blue on its head and back. In May of 2024 a light blue Japanese tree frog was found by a couple on a walk.

The Australian green tree frog is closely related to the magnificent tree frog, although it doesn’t have a parotoid gland hat. It’s mostly green with a white or pale gray belly. It’s sometimes called the dumpy tree frog because it’s a little chonk. Actually, for a frog it’s a pretty big chonk, up to 4 and a half inches long, or over 11 cm. It’s also sometimes called White’s tree frog after John White, who described it in 1790. It was the first Australian frog that was ever scientifically described. But that leads us to a little mystery.

John White named the frog Rana caerulea. Its current scientific name is Ranoidea caerulea. But “caerulea” refers to the color blue, not green, as in cerulean blue.

John White collected the frog in 1788, preserved it in alcohol, and finally described it two years later. He refers to it in his writing as a blue frog and the illustration accompanying it shows frogs that are actually blue. But this frog is supposed to be green!

The main suggestion for why a famously green frog was initially described as blue is that the alcohol that White used to preserve the frog’s body actually destroyed the yellow pigment in its skin. This is something that does sometimes happen with frog specimens in museums. But it’s also possible that White ended up with a blue specimen, much like the blue magnificent tree frog we talked about earlier. He wouldn’t have known that the blue frog had a rare color mutation. That would explain why he referred to the frog as blue and gave it a name that means blue.

That might also explain why White described the Australian green tree frog first. Maybe he just thought it was pretty. Everyone likes the color blue.

Thanks for your support, and thanks for listening! I’m at Dragon Con this weekend, where who knows, I might actually see a blue frog. Anything is possible at Dragon Con.

Further reading:

Parallels for cetacean trap feeding and tread-water feeding in the historical record across two millennia

Haggling over the Hafgufa

Many renditions of the hafgufa/aspidochelone:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

Back in the olden days, as much as 1700 years ago and probably more, up through the 14th century or so, various manuscripts about the natural world talked about a sea monster most people today have never heard of. In ancient Greek it was called aspidochelone, contracted to aspido in some translations, while in Old Norse it was called the hafgufa. But it seemed to be the same type of monster no matter who was writing about it.

The animal was a fish, but it was enormous, big enough that it was sometimes mistaken for an island. When its jaws were open they were said to be as wide as the entrance to a fjord. A fjord is an inlet from the sea originally formed by glaciers scraping away at rocks, and then when the glaciers melted the sea filled the bottom of what was then a steep valley. I’m pretty sure the old stories were exaggerating about the sea monster’s mouth size.

The sea monster ate little fish, but it caught them in a strange way. It would open its mouth very wide at the surface of the water and exude a smell that attracted fish, or in one account it would regurgitate a little food to attract the fish. Once there were lots of little fish within its huge mouth, it would close it jaws quickly and swallow them all.

Generally, any sea monster that’s said to be mistaken for an island was inspired by whales, or sometimes by sea turtles. The hafgufa is actually included in an Old Norse poem that lists types of whales, and the aspidochelone was considered to be a type of whale even though the second part of its name refers to a sea turtle. So whatever this sea monster was, we can safely agree that it wasn’t a fish, it was a whale. Up until just a few centuries ago people thought whales were fish because of their shape, but we know now that they’re mammals adapted to marine life.

But the hafgufa’s behavior is really weird and doesn’t seem like something a whale would do. We’ve talked about skim feeding before, where a baleen whale cruises along at the surface with its mouth held open, until it’s gathered enough food in its mouth and can swallow it all at once. But whales aren’t known to hold their mouths open at the surface of the water and just sit there while fish swim in. At least, they weren’t known to do this until 2011.

In 2011, marine biologists studying humpback whales off Canada’s Vancouver Island in North America observed some of the whales catching herring and other small fish in an unusual way. The whales would remain stationary in the water, tails straight down with the head sticking up partly out of the water. A whale opened its mouth very wide and didn’t move until there were a lot of fish in its mouth, which it then swallowed. Soon after, another team of marine biologists studying Bryde’s whales in the Gulf of Thailand in South Asia observed the same activity when the whales were feeding on anchovies at the surface of the water.

The term for this activity is called trap feeding or tread-water feeding, and at first the scientists thought it was a response to polluted water that had caused the fish to stay closer to the surface. But once the two teams of scientists compared notes, they realized that it didn’t appear to have anything to do with pollution. Instead, it’s probably a way to gather food in a low-energy way, especially when there isn’t a big concentration of fish in any particular spot, and when researchers remembered the story of the hafgufa, they realized they’d found the solution to that mystery sea monster.

The only question was whether the accounts were accurate that the hafgufa emitted a smell or regurgitated food to attract fish. Further observation answered that question too, and it turns out that yes, the old stories were at least partially right. The smell has been compared to rotten cabbage, but it isn’t emitted by the whale on purpose. It’s a smell released when phytoplankton is eaten in large numbers, whether by fish or whales or something else, and it does attract other animals.

As for the regurgitation, this is always something that happens to some degree when a baleen whale feeds. The whale fills its mouth with water that contains the fish and other small animals it eats, and it presses its huge tongue upwards to force the water through its baleen, which acts as a sieve. Whatever’s left in its mouth after the water is expelled, it swallows. But baleen is tough and fish are small and delicate in comparison. Often, fish and other small animals get squished to death against the baleen, and parts of them are expelled with the water. This creates a sort of yucky slurry that could be interpreted as a whale regurgitating food to attract more fish. The scientists think that fish are mainly attracted not to any smell or potential food in the water, but to the supposed shelter offered by the whale’s giant mouth.

It appears that trap feeding is a fairly rare behavior in whales, but one that’s been around a lot longer than the last few years. It’s also possible that because whaling drove many species nearly to extinction and whale numbers are only just starting to recover, until recently whales didn’t need to use this feeding strategy. It seems to be used when a preferred food is widely scattered so that chasing after the fish isn’t worth the energy cost, and that’s more likely to happen when there are a lot of whales around.

It’s amazing that this type of feeding strategy has been identified in two different species of whale, and it’s even more amazing that it matches up so well with ancient accounts. It’s easy to assume that in the olden days, people were kind of stupid, but people back then were just as intelligent as people now. They just didn’t have our technology and modern knowledge. They were often extremely observant, though, and luckily for us, sometimes they were able to write their observations down in books that we can still read.

Thanks for your support, and thanks for listening!

Further reading:

I Can Has Mutant Larvae?

200-Year-Old ‘Monster Larva’ Mystery Solved

‘Snakeworm’ mystery yields species new to science

Hearkening back to the hazelworm

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

A few weeks ago when I was researching big eels, I remembered the mystery eel larva we talked about back in episode 49, and that led me down a fun rabbit hole about other mystery larvae.

Let’s start with that eel larva. Eel larvae can be extremely hard to tell apart, so as a catchall term every eel larva is called a leptocephalus. They’re flattened side to side, which is properly referred to as laterally compressed, and transparent, shaped roughly like a slender leaf, with a tiny head at the front. Depending on the species, an eel may remain in its larval form for more than a year, much longer than most other fish, and when it does metamorphose into its next life stage, it usually grows much longer than its larval form. For instance, the larvae of conger eels are only about 4 inches long, or 10 cm, while an adult conger can grow up to 10 feet long, or 3 meters.

On January 31, 1930, a Danish research ship caught an eel larva 900 feet deep, or about 275 meters, off the coast of South Africa. But the larva was over 6 feet long, or 1.85 meters!

Scientists boggled at the thought that this larva might grow into an eel more than 50 feet long, or 15 meters, raising the possibility that this unknown eel might be the basis of many sea serpent sightings.

The larva was preserved and has been studied extensively. In 1958, a similar eel larva was caught off of New Zealand. It and the 1930 specimen were determined to belong to the same species, which was named Leptocephalus giganteus.

In 1966, two more of the larvae were discovered in the stomach of a western Atlantic lancet fish. They were much smaller than the others, though—only four inches and eleven inches long, or 10 cm and 28 cm respectively. Other than size, they were pretty much identical to Leptocephalus giganteus.

The ichthyologist who examined them determined that the larvae were probably not true eels at all, but larvae of a fish called the spiny eel. Deep-sea spiny eels look superficially like eels but aren’t closely related, and while they do have a larval form that resembles that of a true eel, they’re much different in one important way. Spiny eel larvae grow larger than the adults, then shrink a little when they develop into their mature form. The six-foot eel larva was actually a spiny eel larva that was close to metamorphosing into its adult form.

Not everyone agrees that Leptocephalus giganteus is a spiny eel. Some think it belongs to the genus Coloconger, also called worm eels, which are true eels but which have large larvae that only grow to the same size as adults. But worm eels don’t grow much bigger than about two feet long, or 61 cm. If the mystery larvae does belong to the genus Coloconger, it’s probably a new species. Until scientists identify an adult Leptocephalus giganteus, we can’t know for sure.

Another mystery larva is Planctosphaera pelagica, which sits all alone in its own class because the only thing it resembles are acorn worms, but scientists are pretty sure it isn’t the larva of an acorn worm. It’s not much to look at, since the larva is just a little barrel-shaped blob that grows about 25 mm across. This sounds small compared to the eel larva we just discussed, but it’s actually quite large compared to similar larvae. Acorn worm larvae are usually only about a millimeter long.

Planctosphaera has been classified as a hemichordate, which are related to echinoderms but which show bilateral symmetry instead of radial symmetry. Hemichordates are also closely related to chordates, which include all vertebrates. They’re marine animals that resemble worms but aren’t worms, so it’s likely that Planctosphaera is also wormlike as an adult.

Planctosphaera isn’t encountered very often by scientists. It has limited swimming abilities and mostly floats around near the surface of the open ocean, eating tiny food particles. One suggestion is that it might actually be the larva of a known species, but one where an occasional larva just never metamorphoses into an adult. It just grows and grows until something eats it. So far, attempts to sequence DNA from a Planctosphaera hasn’t succeeded and attempts to raise one to maturity in captivity hasn’t worked either.

Some people have estimated that an adult Planctosphaera might be a type of acorn worm that can grow nine feet long, or 2.75 meters, which isn’t out of the realm of possibility. The largest species of acorn worm known is Balanoglossus gigas, which can grow almost six feet long, or 1.8 meters, and not only is it bioluminescent, its body contains a lot of iodine, so it smells like medicine. It lives in mucus-lined burrows on the sea floor.

Another mystery larva is Facetotecta, which have been found in shallow areas in many oceans around the world. Unlike the other larvae we’ve talked about, they’re genuinely tiny, measured in micrometers, and eleven species have been described. They all have a cephalic shield, meaning a little dome over the head, and scientists have been able to observe several phases of their development but not the adult form. The juvenile form was observed and it looked kind of like a tiny slug with nonfunctioning eyes and weak muscles.

Scientists speculate that facetotecta may actually be the larva of an endoparasite that infests some marine animals. That would explain why no adult form has been identified. Genetic testing has confirmed that Facetotecta is related to a group of parasitic crustaceans.

DNA has solved some mysteries of what larvae belong to which adults. For instance, Cerataspis monstrosa, a larval crustacean that was first described in 1828. It’s over a cm long, pinkish-purple in color with stalked eyes, little swimming leg-like appendages, and neon blue horn-like structures on its head and back which act as armor. The armor doesn’t help too much against big animals like dolphins and tuna, which love to eat it, and in fact that’s where it was initially discovered, in the digestive tract of a dolphin. But scientists had no idea what the monstrous larva eventually grew up to be.

In 2012 the mystery was solved when a team of scientists compared the monster larva’s DNA to that of lots of various types of shrimp, since the larva had long been suspected to be a type of shrimp. It turns out that it’s the larval form of a rare deep-sea aristeid shrimp that can grow up to 9 inches long, or 23 cm.

Let’s finish with another solved mystery, this one from larvae found on land. In 2007, someone sent photos and a bag of little dead worms to Derek Sikes at the University of Alaska Museum. Usually when someone sends you a bag of dead worms, they’re giving you an obscure but distressing message, but Sikes was curator of the insect collection and he was happy to get a bag of mystery worms.

The worms had been collected from an entire column of the creatures that had been crawling over each other so that the group looked like a garden hose on the ground. Sikes thought they were probably fly larvae but he had never heard of larvae traveling in a column. If you’ve listened to the hazelworm episode from August 2018, you might have an idea. The hazelworm was supposed to be a snake or even a dragon that was only seen in times of unrest. It turns out that it the larvae of some species of fungus gnat travel together in long, narrow columns that really do look like a moving snake. But that’s in Europe, not Alaska.

Sikes examined the larvae, but since they were dead he couldn’t guess what type of insect they would grow up to be. Luckily, a few months later he got a call from a forester who had spotted a column of the same worms crossing a road. Sikes got there in time to witness the phenomenon himself.

The larvae were only a few millimeters long each, but there were so many of them that the column stretched right across the road into the forest. He collected some of them carefully and took them back to the museum, where he tended them in hopes that they would pupate successfully.

This they did, and the insects that emerged were a little larger than fruit flies and were black in color. Sikes identified them as fungus gnats, but when he consulted fungus gnat experts in Germany and Japan, they were excited to report that they didn’t recognize the Alaskan gnats. It was a new species, which Sikes described in late 2023. His summer students helped name the species, Sciara serpens, which are better known now as snakeworm gnats. He and his co-authors think the larvae form columns when they cross surfaces like roads and rocks, to help minimize contacting the dry ground. Fungus gnats live in moist areas with lots of organic matter, like forest leaf litter and the edges of ponds.

So the next time you see a huge long snake crossing the road, don’t panic. It might just be a whole lot of tiny, tiny larvae looking for a new home.

Thanks for your support, and thanks for listening!

BONUS: here’s the Hazelworm episode too!

The hazelworm today is a type of reptile, although called the slow worm, blind worm, or deaf adder. It lives in Eurasia, and while it looks like a snake, it’s actually a legless lizard. It can even drop and regrow its tail like a lizard if threatened. It spends most of its time underground in burrows or underneath leaf litter or under logs. It grows almost 2 feet long, or 50 cm, and is brown. Females sometimes have blue racing stripes while males may have blue spots. It eats slugs, worms, and other small animals, so is good for the garden.

But that kind of hazelworm isn’t what we’re talking about here. Back in the middle ages in central Europe, especially in parts of the Alps, there were stories of a big dragonlike serpent that lived in areas where hazel bushes were common. Like its slow-worm namesake, it lived most of its life underground, especially twined around the roots of the hazel. Instead of scales, it had a hairy skin and was frequently white in color. It was supposed to be the same type of snake that had tempted Adam and Eve in the Garden of Eden.

It had a lot of names besides hazelworm, including white worm for its color, paradise worm for its supposed history in the Garden of Eden, and even war worm. That one was because it was only supposed to show itself just before a war broke out.

People really believed it existed, although stories about it sound more like folklore. For instance, anyone who ate hazelworm flesh was supposed to become immortal. It was also supposed to suck milk from dairy cows and spread poison.

Some accounts said it was enormous, as big around as a man’s thigh and some 18 feet long, or 5.5 meters. Sometimes it was even supposed to have feet, or have various bright colors. Sometimes drawings showed wings.

There does seem to be some confusion about stories of the hazelworm and of the tatzelwurm, especially in older accounts. But unlike the tatzelwurm, the mystery of the hazelworm has been solved for a long time—long enough that knowledge of the animal has dropped out of folklore.

Back in the 1770s, a physician named August C. Kuehn pointed out that hazelworm sightings matched up with a real animal…but not a snake. Not even any kind of reptile. Not a fish or a bird or a mammal. Nope, he pointed at the fungus gnat.

The fungus gnat is about 8 mm long and eats decaying plant matter and fungus. You know, sort of exactly not like an 18-foot hairy white snake.

But the larvae of some species of fungus gnat are called army worms. The larvae have white, gray, or brown bodies and black heads, and travel in long, wide columns that do look like a moving snake, especially if seen in poor light or in the distance. I’ve watched videos online of these processions and they are horrifying! They’re also rare, so it’s certainly possible that even people who have lived in one rural area their whole life had never seen an armyworm procession. Naturally, they’d assume they were seeing a monstrous hairy snake of some kind, because that’s what it looks like.

Sightings of smaller hazelworms may be due to the caterpillar of the pine processionary moth, which also travels in a line nose to tail, which looks remarkably like a long, thin, hairy snake. Don’t touch those caterpillars, by the way. They look fuzzy and cute but their hairs can cause painful reactions when touched.

The adult moths lay their eggs in pine trees and when the eggs hatch the larvae eat pine needles and can cause considerable damage to the trees. They overwinter in silk tents, then leave the trees in spring and travel in a snaky conga line to eat pine needles. Eventually they burrow underground to pupate. They emerge from their cocoons as adult moths, mate, lay eggs, and die, all within one day.

It’s the annual discoveries episode! Thanks to Stephen and Aryeh for their corrections and suggestions this week!

Further reading:

Salinella Salve: The Vanishing Creature That Defied Science for Over a Century

Three new species of the genus Scutiger

Baeticoniscus carmonaensis sp. nov. a new Isopod found in an underground aqueduct from the Roman period located in Southwest Spain (Crustacea, Isopoda, Trichoniscidae)

A new species of supergiant Bathynomus

Giant ‘Darth Vader’ sea bug discovered off the coast of Vietnam

A New Species of easter egg weevil

Bizarre ‘bone collector’ caterpillar discovered by UH scientists

Researchers Discover ‘Death Ball’ Sponge and Dozens of Other Bizarre Deep-Sea Creatures in the Southern Ocean

1,500th Bat Species Discovered in Africa’s Equatorial Guinea

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week we’re going to learn about some animals discovered in 2025! We’ll also make this our corrections episode. This is the last new episode we’ll have until the end of August when we reach our 500th episode, but don’t worry, until then there will be rescheduled Patreon episodes every single week as usual.

We’ll start with some corrections. Shortly after episode 452 was published in September, where we talked about the swamp wallaby and some other animals, Stephen emailed to point out that I’d made a major mistake! In that episode I said that not all animals called wallabies were actually members of the family Macropodidae, but that’s actually not the case. All wallabies are macropodids, but they aren’t all members of the same genus in that family. I corrected the episode but I wanted to mention it here too so no one is confused.

Stephen also caught another mistake in episode 458, which is embarrassing. I mentioned that marsupials didn’t just live in Australia, they were found all over the world. That’s not actually the case! Marsupials are found in North and South America, Australia, New Guinea and nearby areas, and that’s it. They were once also found in what is now Asia, but that was millions of years ago. So I apologize to everyone in Africa, Asia, and Europe who were excited about finding out what their local marsupials are. You don’t have any, sorry.

One update that Aryeh asked about specifically is an animal we talked about in episode 445, salinella. Aryeh emailed asking for more information if I could find any, because it’s such a fascinating mystery! I looked for some more recent findings, unfortunately without luck. I do have an article linked in the show notes that goes into detail about everything we covered in that episode, though, dated to mid-January 2026, and it’s a nice clear account.

Now, let’s get into the 2025 discoveries! There are lots more animals that were discovered last year, but I just chose some that I thought were especially interesting. Mostly I chose ones that I thought had funny names.

Let’s start with three new species of frog in the genus Scutiger. Species in this genus are called lazy toads and I couldn’t find out why. Maybe they don’t like to move around too much. Lazy toads live in mountains in some parts of Asia, and we don’t know very much about most of the 31 species described so far. Probably the most common lazy toad is the Sikkim lazy toad that lives along high altitude streams in the Himalaya Mountains. It’s mottled greenish-brown and yellowish in color with lots of warts, and while its feet have webbed toes, it doesn’t have webbed fingers on its little froggy hands. This is your reminder that every toad is a frog but not every frog is a toad. The Sikkim lazy toad grows about two and a half inches long, or about 65 mm, from nose to butt. It seems to be pretty average for a lazy toad.

The three new species of lazy toad are found in Yunnan Province in China, in a mountainous region where several species of lazy toad were already known. Between 2021 and 2024, a team of scientists collected 27 lazy toads from various places, then carefully examined them to see if they were species already known to science. This included genetic analysis. The team compared their findings with other lazy toad species and discovered that not all of the specimens matched any known species. Further comparison with each other revealed that the team had discovered three new species, which they described in December of 2025.

Next, isopods are common crustaceans that live throughout the world. You have undoubtedly seen at least one species of isopod, because an animal with lots of common names, including woodlouse, pill bug, roly-poly, and sowbug, is a terrestrial isopod. That’s right, the roly-poly is not a bug or a centipede but a crustacean. The order Isopoda contains more than 10,000 species, and there are undoubtedly thousands more that haven’t been discovered by scientists yet. About half the species discovered so far live on land and the other half live in water, most in the ocean but some in fresh water. They don’t all look like roly-polies, of course. Many look like their distant crustacean cousins, shrimps and crayfish, while others look more like weird centipedes or fleas or worms. There’s a lot of variation in an animal that’s extremely common throughout the world, so it’s no surprise that more species are discovered almost every year.

In 2021 and 2022, a team of Spanish scientists took a biological survey of an ancient Roman tunnel system beneath Carmona, Spain. The tunnels were built around 2,000 years ago as a water source, since they capture groundwater, but it hasn’t been used in so long that it’s more or less a natural environment these days.

The scientists quickly discovered plenty of life in the tunnels, including an isopod living in cracks in some ancient timbers. It grows about two and a half millimeters long and actually does look a lot like a tiny roly-poly. It has long antennae and its body mostly lacks pigment, but it does have dark eyes. Most animals that live in total darkness eventually evolve to no longer have functioning eyes, since they don’t need them, but that isn’t the case for this new isopod. Scientists think it might take advantage of small amounts of light available near the tunnel entrances.

As far as the scientists can tell, the Carmona isopod only lives in this one tunnel system, so it’s vulnerable to pollutants and human activity that might disrupt its underground home.

Another new isopod species that’s vulnerable to human activity, in this case overfishing, lives off the coast of Vietnam. It’s another isopod that looks a lot like a roly-poly, which I swear is not what every isopod looks like. It’s a deep-sea animal that hunts for food on the ocean floor, and it’s a popular delicacy in Vietnam. Remember, it’s a crustacean, and people say it tastes like another crustacean, lobster. In fact, scientists discovered their specimens in a fish market.

Deep-sea animals sometimes feature what’s called deep-sea gigantism. Most isopods are quite small, no more than a few cm at most, but the new species grows almost 13 inches long, or over 32 cm. It’s almost the largest isopod known. Its head covering made the scientists think of Darth Vader’s helmet, so it’s been named Bathynomus vaderi.

Next we have a new species of Easter egg weevil, a flightless beetle found on many islands in Southeast Asia. Easter egg weevils are beautiful, with every species having a different pattern of spots and stripes. Many are brightly colored and iridescent. The new species shows a lot of variability, but it’s basically a black beetle with a diamond-shaped pattern that can be yellow, gold, or blue. Some individuals have pink spots in the middle of some of the diamonds. It’s really pretty and that is just about all I could find out about it.

Another new insect is a type of Hawaiian fancy case caterpillar, which metamorphose into moths. They’re only found on the Hawaiian islands, and there are over 350 species known. The new species has been named the bone collector, because of what the caterpillar does.

Fancy case caterpillars spin a sort of shell out of silk, which is called a case, and the caterpillar carries its case around with it as protection. Some of the cases are unadorned but resemble tree bark, while many species will decorate the case with lichens, sand, or other items that help it blend in with its background. Some fancy case caterpillars can live in water as well as on land, and while most caterpillars eat plant material, some fancy case caterpillars eat insects.

That’s the situation with the bone collector caterpillar. It lives in spider webs, which right there is astonishing, and decorates its case with bits and pieces of dead insect it finds in the web. This can include wings, heads, legs, and other body parts.

The bone collector caterpillar eats insects, and it will chew through strands of the spider’s web to get to a trapped insect before the spider does. Sometimes it will eat what’s left of a spider’s meal once the spider is finished.

The bone collector caterpillar has only been found in one tiny part of O’ahu, a 15-square-km area of forest, although researchers think it was probably much more widespread before invasive plants and animals were introduced to the island.

Next, the Antarctic Ocean is one of the least explored parts of the world, and a whole batch of new species was announced in 2025 after two recent expeditions. One of the expeditions explored ocean that was newly revealed after a huge iceberg split off the ice shelf off West Antarctica in early 2025. That’s not where the expedition had planned to go, but it happened to be nearby when the iceberg broke off, and of course the team immediately went to take a look.

Back in episode 199 we talked about some carnivorous sponges. Sponges have been around for more than half a billion years, and early on they evolved a simple but effective body plan that they mostly still retain. Most sponges have a skeleton made of calcium carbonate that forms a sort of dense net that’s covered with soft body tissues. The sponge has lots of open pores in the outside of its body, which generally just resembles a sack or sometimes a tube, with one end attached to something hard like a rock, or just the bottom of the ocean. Water flows into the sponge’s tissues through the pores, and special cells filter out particles of food from the water, much of it microscopic, and release any waste material. The sponge doesn’t have a stomach or any kind of digestive tract. The cells process the food individually and pass on any extra nutrients to adjoining cells.

In 1995, scientists discovered a tiny sponge that wasn’t a regular filter feeder. It had little hooks all over it, and it turns out that when a small animal gets caught on the hooks, the sponge grows a membrane that envelops the animal within a few hours. The cells of the membrane contain bacteria that help digest the animal so the cells can absorb the nutrients.

Since then, other carnivorous sponges have been discovered, or scientists have found that some sponges already known to science are actually carnivorous. That’s the case with the ping-pong tree sponge. It looks kind of like a bunch of grapes on a central stem that grows up from the bottom of the ocean, and it can be more than 20 inches tall, or 50 cm. The little balls are actually balloon-like structures that inflate with water and are covered with little hooks. It was discovered off the coast of South America near Easter Island, in deep water where the sea floor is mostly made of hardened lava. It was classified in the genus Chondrocladia, and so far there are more than 30 other species known.

The reason we’re talking about the ping-pong tree sponge is that a new species of Chondrocladia has been discovered in the Antarctic Ocean, and it looks a lot like the ping-pong tree sponge. It’s been dubbed the death-ball sponge, which is hilarious. It was found two and a quarter miles deep on the ocean floor, or 3.6 km, and while scientists have determined it’s a new species of sponge, it hasn’t been described yet. It’s one of 30 new species found so far, and the team says that there are many other specimens collected that haven’t been studied yet.

We haven’t talked about any new mammal discoveries yet, so let’s finish with one of my favorites, a new bat! It was discovered on Bioko Island in Equatorial Guinea, which is part of Africa. During a 2024 biodiversity assessment on the island, a PhD student named Laura Torrent captured a bat that turned out to be not only a brand new species, it is the 1,500th species of bat known to science!

Pipistrellus etula gets its name from the local language, Bantu, since “etula” means both “island” and “god of the island” in that language. The bat was found in forests at elevations over 1,000 meters, on the slopes of a volcano. Back in 1989, a different researcher captured a few of the bats on another volcano, but never got a chance to examine them to determine if they were a new species. When Torrent’s team were studying their bats, one of the things they did was compare them to the preserved specimens from 1989, and they discovered the bats were indeed a match.

P. etula is a type of vesper bat, which is mostly active at dusk and eats insects. It’s brown with black wings and ears. Just like all the other species we’ve talked about today, now that we know it exists, it can be protected and studied in the wild.

That’s what science is really for, after all. It’s not just to satisfy our human curiosity and desire for knowledge, although that’s important too. It’s so we can make this world a better place for everyone to live—humans, animals, plants, isopods, weird caterpillars, and everything else on Earth and beyond.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. Thanks for listening! I’ll see you in August.

Thanks to Aila, Stella, George, Richard from NC, Emilia, Emerson, and Audie for their suggestions this week!

Further reading:

Creature Feature: Snipe Eel

How removing a dam could save North Carolina’s ‘lasagna lizard’

Why Has This North Carolina Town Embraced a Strange Salamander?

Scentists search for DNA of an endangered salamander in Mexico City’s canals

An X-ray of the slender snipe eel:

The head and body of a slender snipe eel. The rest is tail [picture by opencage さん http://ww.opencage.info/pics/ – http://ww.opencage.info/pics/large_17632.asp, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=26595467]:

The hellbender:

A wild axolotl with its natural coloration:

A captive bred axolotl exhibiting leucism:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week we’re going to talk about some amphibians and fish. Thanks to Aila, Stella, George, Richard from NC, Emilia, Emerson, and Audie for their suggestions!

We’ll start with Audie’s suggestion, the sandbar shark. It’s an endangered shark that lives in shallow coastal water in the Atlantic and Indo-Pacific Oceans. A big female can grow over 8 feet long, or 2.5 meters, while males are smaller on average. It can be brown or gray in color, and its dorsal fin is especially big for a shark its size.

The sandbar shark eats fish, crustaceans like crabs, cephalopods like octopuses, and other small animals. It spends a lot of time near the bottom of the seabed, looking for food, and it will also swim into the mouths of rivers. Since it resembles a bull shark, which can live just fine in rivers for quite a while and which can be dangerous to swimmers, people are sometimes afraid of the sandbar shark, but it hardly ever bites people. It just wants to be left alone to find little fish to eat.

Emilia and Emerson both asked to learn more about eels. Eels are fish, but not every animal that’s called an eel is actually an eel. Some are just eel-shaped, meaning they’re long and slender. Electric eels aren’t actually eels, for instance, but are more closely related to catfish.

The longest eel ever reliably measured was a slender giant moray. That was in 1927 in Queensland, Australia. The eel measured just shy of 13 feet long, or 3.94 meters. We talked about some giant eels in episode 401, but this week let’s talk about a much smaller eel, one that Emerson suggested.

That’s the snipe eel, the name for a family of eels consisting of nine species known so far. They live in every ocean in the world, and some species are deep-sea animals but most live a little nearer the surface. The largest species can grow an estimated 5 feet long, or 1.5 meters, but because all species of snipe eel are so incredibly thin, even the longest individual weighs less than a football, either American or regular, take your pick.

The snipe eel gets its name from its mouth, which is long and slightly resembles the beak of a bird called the snipe. The snipe is a wading bird that pokes its long, flexible bill into mud to find small animals like insect larvae, worms, and snails. But unlike the bird’s bill, the snipe eel’s jaws have a bend at the tip. The upper jaw bends upward, the lower jaw bends downward so that the tip of the jaws are separated. It doesn’t look like that would be very helpful for catching food, but scientists think it helps because the fish’s mouth is basically always open. Since it mainly eats tiny crustaceans floating in the water, it doesn’t even need to open its mouth to catch food. It has tiny teeth along the jaws that point backwards, so when a crustacean gets caught on the teeth, it can’t escape.

The slender snipe eel is especially unusual because it can have as many as 750 vertebrae in its backbone. That’s more than any other animal known. Most of its length is basically just an incredibly long, thin tail, with its organs bunched up right behind its head. Even its anus is basically on its throat.

We don’t know a whole lot about the snipe eel, since it lives deep enough that it’s hardly ever seen by humans. Most of the specimens discovered have been found in the stomachs of larger fish.

Now, let’s leave the world of fish behind and look at some amphibians. First, George wanted to learn about the hellbender, and points out that it’s also called the snot otter or lasagna lizard. I don’t understand the lasagna part but it’s funny.

The hellbender is a giant salamander that lives in parts of the eastern United States, especially in the Appalachian Mountains and the Ozarks. It can grow nearly 30 inches long, or 74 cm, and is the fifth heaviest amphibian alive today in the whole world. It spends almost all its life in shallow, fast-moving streams hiding among rocks. As water rushes over and around rocks, it absorbs more oxygen, which is good for the hellbender because as an adult it breathes through its skin. To increase its surface area and help it absorb that much more oxygen, its skin is loose and has folds along the sides.

The hellbender is flattened in shape and is brown with black speckles on its back. It mostly eats crayfish, but it will also eat frogs and other small animals. Its skin contains light-sensitive cells, which means that it can actually sense how much light is shining on its body even if its head is hidden under a rock, so it can hide better.

Aila and Stella suggested we talk about the axolotl, and a few years ago Richard from NC sent me a lot of really good information about this friendly-looking amphibian. I’d been planning to do a deep dive about the axolotl, which we haven’t talked about since episode 275, but sometimes having a lot of information leads to overload and I never did get around to sorting through everything Richard sent me.

Richard also suggested we talk about a rare mudpuppy, so let’s learn about it before we get to the axolotl. It’s called the Neuse river waterdog, although Richard refers to it as the North Carolina axolotl because it resembles the axolotl in some ways, although the two species aren’t very closely related.

The mudpuppy, also called the waterdog, looks a lot like a juvenile hellbender but isn’t as big, with the largest measured adult growing just over 17 inches long, or almost 44 cm. It lives in lakes, ponds, and streams and retains its gills throughout its life.

The mudpuppy is gray, black, or reddish-brown. It has a lot of tiny teeth where you’d expect to find teeth, and more teeth on the roof of its mouth where you would not typically expect to find teeth. It needs all these teeth because it eats slippery food like small fish, worms, and frogs, along with insects and other small animals.

The Neuse River waterdog lives in two watersheds in North Carolina, and nowhere else in the world. It will build a little nest under a rock by using its nose like a shovel, pushing at the sand, gravel, and mud until it has a safe place to rest. If another waterdog approaches its nest, the owner will attack and bite it to drive it away.

The mudpuppy exhibits neoteny, a trait it shares with the axolotl. In most salamanders, the egg hatches into a larval salamander that lives in water, which means it has external gills so it can breathe underwater. It grows and ultimately metamorphoses into a juvenile salamander that spends most of its time on land, so it loses its external gills in the metamorphosis. Eventually it takes on its adult coloration and pattern. But neither the mudpuppy nor the axolotl metamorphose. Even when it matures, the adult still looks kind of like a big larva, complete with external gills, and it lives underwater its whole life.

The axolotl originally lived in wetlands and lakes in the Mexico Central Valley. This is where Mexico City is and it’s been a hub of civilization for thousands of years. A million people lived there in 1521 when the Spanish invaded and destroyed the Aztec Empire with introduced diseases and war. The axolotl was an important food of the Aztecs and the civilizations that preceded them, and if you’ve only ever seen pictures of axolotls you may wonder why. Salamanders are usually small, but a full-grown axolotl can grow up to 18 inches long, or 45 cm, although most are about half that length.

Most wild axolotls are brown, greenish-brown, or gray, often with lighter speckles. They can even change color somewhat to blend in with their surroundings better. Captive-bred axolotls are usually white or pink, or sometimes other colors or patterns. That’s because they’re bred for the pet trade and for medical research, because not only are they cute and relatively easy to keep in captivity, they have some amazing abilities. Their ability to regenerate lost and injured body parts is remarkable even for amphibians. Researchers study axolotls to learn more about how regeneration works, how genetics of coloration work, and much more. They’re so common in laboratory studies that you’d think there’s no way they could be endangered—but they are.

A lot of the wetlands where the axolotl used to live have been destroyed as Mexico City grows. One of the lakes where it lived has been completely filled in. Its remaining habitat is polluted and contains a lot of introduced species, like carp, that eat young axolotls as well as the same foods that axolotls eat. Conservationists have been working hard to improve the water quality in some areas by filtering out pollutants, and putting up special barriers that keep introduced fish species out.

Even if the axolotl’s habitat was pristine, though, it wouldn’t be easy to repopulate the area right away. Axolotls bred for the pet trade and research aren’t genetically suited for life in the wild anymore, since they’re all descended from a small number of individuals caught in 1864, so they’re all pretty inbred by now.

Mexican scientists and conservationists are working with universities and zoos around the world to develop a breeding program for wild-caught axolotls. So far, the offspring of wild-caught axolotls that are raised in as natural a captive environment as possible have done well when introduced into the wild. The hard part is finding wild axolotls, because they’re so rare and so hard to spot.

Scientists have started testing water for traces of axolotl DNA to help them determine if there are any to find in a particular area. If so, they send volunteers into the water with nets and a lot of patience to find them.

The axolotl reproduces quickly and does well in captivity. Hopefully its habitat can be cleaned up soon, which isn’t just good for the axolotl, it’s good for the people of Mexico City too.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. If you have questions, comments, corrections, or suggestions, email us at [email protected].

Thanks for listening!