BirdNote Daily

The Common Murre is among the few species of birds that can "fly" under water. When above the water, the 18"-long murre must flap frantically to stay aloft. But beneath the waves, with its flipper-like wings partly extended, it is a streamlined, masterful swimmer. Common Murres, black and white torpedoes with feathers, chase down fish even several hundred feet below the surface. Cornell's Macaulay Library offers audio and video of Common Murres.

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The Golden-crowned Kinglet weighs six grams, about the same as two pennies, yet winters as far north as Alaska and Nova Scotia. The birds move through the forest in small flocks and feed constantly, taking in enough tiny caterpillars to maintain their internal furnace at 110°F. And their insulation keeps them warm. Their feathers make up 8% of their body weight, equivalent to the weight of the clothing of an arctic explorer.

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In the warmer regions of the world’s oceans, large seabirds called boobies plunge headfirst into the water, snatching up fish. But as a booby flies up from the waves with a fish now in its gullet, there may be another big seabird — a frigatebird — with its eye on the booby’s fresh catch. Now begins one of nature’s great chase scenes. Fortunately for boobies, frigatebirds don’t steal all their meals. Most of the time, they hunt their own seafood — perhaps a squid snapped from the ocean surface or a flying fish as it skims across the waves.

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Developing eggshells requires a key ingredient — calcium — in larger quantities than the female typically has in her bloodstream. Just how different bird species supply or store calcium for egg-laying isn’t fully known. While some species seek out extra calcium from their environment, many species simply "borrow" calcium directly from their leg bones! The eggs seen here are those of an Anna's Hummingbird.

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Day Scott’s interest in birds grew following a car accident that resulted in a traumatic brain injury. As she recovered, she would sit in the kitchen and watch birds at the feeder through the window. She began noticing bird behavior, like how members of the same species competed for space at the feeder. Watching the birds became a source of joy for her. Day eventually began writing stories about the birds and shared them with people along with her photos on Instagram.

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Catia Lattouf cares for dozens of hummingbirds from her home!In Mexico City, 73-year-old Catia Lattouf started a hummingbird hospital — in her apartment! She hosts dozens of hummingbirds as they recover from injuries. Catia, who once ran a French high-fashion boutique, began caring for hummingbirds in 2012, after she survived cancer that was considered terminal. She received her first injured hummingbird, and named him Gucci.

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Most duck species court and form pair bonds in winter. In the icy waters of Vermont’s Lake Champlain, Common Goldeneyes are getting hot! This male is displaying his signature move, the “head-throw-kick,” to attract a mate. Goldeneye pairs now bonding throughout the US will migrate in early spring toward breeding waters across Canada and Alaska. But the males are ramblers. After the female lays her eggs, the goldeneye male abandons his mate and parental duties. It’s common conduct among ducks!

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Both the Willow Ptarmigan and these White-tailed Ptarmigan, feathered mostly brown in summer, are utterly transfigured by an autumn molt. As snow begins to mantle their world, both species, now all white, blend in superbly. But the ptarmigan pulls another trick. It adds dense white feathering on both the tops and bottoms of its feet. And its claws grow longer. The bird grows snowshoes!

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The word “dove” might make you think of an elegant bird symbolizing peace, while the word “pigeon” might bring up images of rowdy flocks of city birds. But there’s no formal distinction between doves and pigeons, only a linguistic one. In many languages, the birds are one and the same. The dove and pigeon family includes some of the most beautiful birds in the world.

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The treeswifts of India, Southeast Asia, New Guinea, and beyond make their nests out of bits of plants and feathers and hold it all together with some very sticky saliva. A treeswift’s whole nest is but a tiny cup — just large enough to hold a single egg — stuck to a bare upright branch. The adult on the nest appears simply to be perching, not sitting on a nest. Ingenious!

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