Los halcones gerifaltes (F alco rusticolus) son aves circumpolares que anidan en las regiones más remotas del norte de Asia, América del Norte y Europa, incluyendo Islandia y Groenlandia. Estas aves evolucionaron como una especie distinta durante el Pleistoceno, hace unos 100,000 años. Su…

The way that some birds flick, wag, or flare their tails can be distinctive. A flicking or flashing tail might suggest to a predator that a bird is particularly alert or hard to catch, while also warning others in the flock of danger. Tail flicking can also help flush out prey. A Hooded…

Black Scoters are sea ducks that spend the winter on saltwater bays. They are large, strong ducks and buoyant swimmers with a habit of cocking their tails upward. Black Scoters nest each summer on freshwater tundra ponds. Each fall, they can be found on bays all across the Northern…

Bird feeders full of seeds or suet can spark nonstop action. Chickadees flitter in and out. Finches expertly crack one seed after another, while jays, doves, woodpeckers and sparrows all join the flurry. This might bring to mind a neighborly picnic — but it’s not quite as friendly. At any…

A parrot’s eyes are located on the sides of its head. So, if it wants to look at something — say, a delicious piece of fruit — it has to cock its head one way or the other do it. And if it looks with its left eye, then it uses its left foot. Scientists call this handedness. That’s when one…

Many birds that play do it alone by swinging, sliding, or rolling around. Some species interact with objects, like dropping a stone and picking it up again. But a select few birds – like these crows – play with other members of their species. Scientists call this social play. It appears to…

Great Black-backed Gulls have a reputation as serious predators of other birds like puffins, grebes, and songbirds as big as a grackle. Just over a century ago, these birds were nearly wiped out by feather hunters and egg collectors. And though their populations recovered with help from…

The Virginia Rail is a secretive bird, a relative of coots and cranes. And it's a bird you'll more often hear than spy. The rail takes its name from its narrow body (you know the saying, "as skinny as a rail") an adaptation to its favorite marshy habitats. A Virginia Rail walks hidden…

The Ruddy Turnstone stands out among sandpipers. On taking flight, the turnstone flashes a vivid and unmistakable pattern of dark and light striping across its wings and tail. And that comical chatter is one of a kind too. Unlike most sandpipers, Ruddy Turnstones favor rocky beaches and…

Trumpeter Swans are among the world's largest flying waterfowl. They can weight up to 25 pounds and have a wingspan of nearly seven feet! These swans migrate in family groups each fall from nesting sites in Canada and Alaska to wintering grounds in the central U.S. Trumpeter Swans are…