BirdNote Daily

In the 1990s, train engineers in Japan built trains able to travel nearly 170 miles per hour. The problem was that when the trains exited a tunnel, the air in front of their bullet-shaped noses expanded rapidly, creating a loud “tunnel boom.” The chief engineer, a birder, looked to the shape of a kingfisher’s bill to design long, narrow train noses that parted the air. The trains became both quieter and more efficient. Learn more at BirdNote.org.

Flapping with deep, slow wing-motion, a Short-eared Owl appears almost to float above the ground. This owl has an extensive world range, including North and South America, Europe, and Asia. Still, it's declining, due to development, agriculture, and overgrazing. American Bird Conservancy and Partners in Flight consider this bird at-risk. But the federal Conservation and Wetland Reserve Programs are showing promise for Short-eared Owls, by preserving large blocks of habitat. Let your elected representatives know that you support these programs! Learn more at BirdNote.org.

On a winter morning in Costa Rica, a colorful choir welcomes the day. A pair of Bay Wrens sings a brisk duet just before sunrise. Perched in the upper canopy of the tropical lowland forest, a group of Keel-billed Toucans calls out. In a nearby tree, Purple-throated Fruitcrows (like this one) add their voices to the chorus. Then a male Montezuma Oropendola belts out an electrifying series of notes — one of the most distinctive voices in the tropics. Finally, a Bright-rumped Attila calls from its perch. Learn more at BirdNote.org.

This show pairs birds that make sounds on opposite extremes: the highest-pitched bird, the Black Jacobin hummingbird, duets with the Southern Cassowary, one of the lowest-pitched birds. The faint, buzzy song of the Grasshopper Sparrow joins the voice of the White Bellbird, the loudest bird in the world.

This show was produced by World According to Sound. BirdNote and World According to Sound are teaming up for an immersive, 70-minute, virtual event about the sounds of birds. Learn more at BirdNote.org.

A tube of black oil sunflower seeds isn’t “natural”…and neither is a suet cake. Yet as soon as you hang them up, the neighborhood birds, like these female finches, find them. Those grosbeaks at your feeder probably never ate sunflower seeds in nature. Sunflowers grow in open plains, while grosbeaks live in forests. But birds have a substantial capacity to learn, either by action or by witnessing other birds at a feeder. Learn more at BirdNote.org.

A typical bird nest will have maybe four to six eggs neatly arranged by the parent to hunker down on. But in one Rhea nest, you may find between 50 and 80 eggs! And they’re not all from the same set of parents. Male Rheas mate with several females and then build a single nest on the ground to hold all the eggs from each of them. Learn more at BirdNote.org.

Rosemary Mosco was drawn to birds as a shy child, because they rewarded patience. In college, she struggled to connect with her classes in anthropology. She began volunteering with a group in Toronto that tries to stop birds from hitting windows. At the same time, she created a cartoon about a lonely bird that befriends the moon and flies around the city having adventures. She now combines art and science as a cartoonist and science writer. Learn more at BirdNote.org.

A Merlin — like this one — hunts boldly from a high perch. A Peregrine Falcon dives on a hapless pigeon, with an air speed approaching 200 miles per hour. The Gyrfalcon can fly down even the fastest waterfowl in a direct sprint. A Prairie Falcon blends in with its background. And the smallest North American falcon of all, the American Kestrel, hovers a field, watching for a mouse or large insect. Learn more at BirdNote.org.

The Reddish Egret, a particularly glamorous heron, is best known for its startling antics in capturing fish. When fishing, the egret sprints across the lagoon, weaving left and right, simultaneously flicking its broad wings in and out, while stabbing into the water with its bill. Fish startled at the egret’s crazed movements become targets of that pink dagger. At times, the bird will raise its wings forward over its head, creating a shadow on the water. It then freezes in this position for minutes. Fish swim in, attracted by a patch of shade and . . . well, you know the rest. Learn more at BirdNote.org.

For most birds, keen eyesight is critical for survival. But many birds lead lives that can be very hard on the eyes — like flying at breakneck speed, racing for cover into a dense thicket, or diving under water to capture prey. Imagine how the chips fly as this Pileated Woodpecker chisels a cavity. Fortunately, birds have evolved a structure for protecting their eyes. Beneath the outer eyelids lies an extra eyelid, called the nictitating membrane. It helps keep the eye moist and clean while guarding it from wind, dust, and hazards. Learn more at BirdNote.org.