BirdNote Daily

To figure out the source of a hummingbird’s hum, scientists built a special rig to measure air pressure, twelve high-speed cameras, and over 2000 microphones to observe hummingbirds fluttering in place at an artificial flower. The researchers found that the hum derives from the difference in air pressure between the top and bottom of the wings, which alternates forty times a second as the hummingbird flaps. The rapidly shifting air pressure produces a harmonic set of sounds, from low to high, creating that iconic, musical hum.

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Connecticut Warblers nest in the northern boreal forests, migrate through the Midwest, and winter in the rainforests of South America. Even with all that traveling, you rarely see one of these birds. Though their loud, ringing song might be easy to identify, it often seems to emanate from low in a tree when the warbler is perched high in the crown, frustrating birders from Canada to Brazil.

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Marina Castellino and her sister Marcela share a love of birds, especially those living in Mar Chiquita, one of South America’s largest wetlands. Marina got inspired from seeing her older sister’s love for shorebirds. The two sisters helped get Mar Chiquita declared a National Park and National Reserve for Argentina. That supports birds like sandpipers that migrate between South and North America. So if you see one near you, efforts from Marina may have helped you see it there!  

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White-breasted Nuthatches aren’t the toughest birds on the block — but when it comes to their nests, they know how to put up defenses. Squirrels could easily duck inside a nest cavity and gobble up the eggs. That’s why you might see nuthatches sweeping around their nest hole with a beetle or other insect. It’s thought that chemical compounds from the insect smell bad to squirrels, driving them away. And if that doesn’t work, nuthatches try to make themselves look as big as possible.

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Puffins fly under water into schools of slender fish, filling their large beaks. Fish are wedged into the gape, the stretchy skin at the beak hinge, but the bill edges still line up neatly. The dangling fish won’t slide out because the puffin’s tongue and roof of the mouth are heavily lined with backward-angled spines. When its beak is full, the adult flies back to its nest and feeds it all to a single chick.

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When Florida became a state in 1845, the legislature declared the Everglades, America's largest wetland, totally worthless. In 1905, Napoleon Bonaparte Broward was elected governor on a campaign to drain them. So over the years, the slowly flowing "River of Grass" has been replaced by a series of reservoirs with little water movement. The endangered Snail Kite feeds only on the Apple Snail. And neither kites nor snails flourish in places that are permanently under water. Learn more at StateOfTheBirds.org.

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Every spring in Northwest Ohio, the shores of Lake Erie transform into a birder’s paradise. Birder and author Kenn Kaufman, who lives in this area, says that of the many species that migrate through here, one group of vibrant, vivacious songbirds stands out from the rest: warblers. Trees leaf out later in the season along the lakeshore, making the tiny warblers easier to see as they forage for food. Northwest Ohio has earned a reputation as the Warbler Capital of the World among birders in the know. But Kenn wishes everyone could glimpse the beauty of warbler migration, even if they don’t make it to the Warbler Capital.

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In the animal world, large, charismatic species tend to get the most attention. But for the Kori Bustard, the largest flying bird in Africa, that attention hasn't translated to a ton of scientific research. Katherine Mertes, a research ecologist at the Smithsonian Conservation Biology Institute, tracks animals for a living, and a few years ago she was focused on Kori Bustards. Her team used solar-powered tracking devices to study the bustards’ movements. But first, they had to catch the birds — and trying to gently herd a bustard into a giant net is quite a task.

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Many bird species can eat the fruits of plants that are toxic to humans —even the white berries found on poison ivy. These birds just aren’t sensitive to the compounds in the berries that are irritating or poisonous to people. While you probably want to stay away from poison ivy, you can improve habitats for birds by planting native fruit bushes and advocating for wildlife-friendly gardening in public green spaces. 

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Marcela Castellino works as a conservation specialist for Manomet’s Flyways team, visiting wetlands, salt lagoons, and salt flats around Mar Chiquita in Argentina, one of South America’s biggest salty wetlands. She surveys shorebirds to track their populations and strengthen their conservation. One species she studies, Wilson’s Phalarope, travels from their breeding grounds in North America to winter in huge numbers at Mar Chiquita. As they feed, they swim in circles, swirling the water and stirring up things to eat.

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