The cries of a Killdeer are familiar across most of the US during spring and summer. But where do they go in winter? Killdeer that breed in the southern half of the US and along the Pacific Coast are year-round residents. But those that breed in the northern US and Canada, where winter…

A stiff December breeze blowing down the Columbia River delivers an exhilarating chill. A stretch of river near Bridgeport, in north-central Washington, is held tightly by a series of dams, creating massive lakes. High on an overlook, a Bald Eagle watches a flock of birds – coots, ducks…

Holiday cards often feature gorgeous red cardinals against a snowy landscape. So it’s easy to assume the birds have always been a colorful presence in bleak Northern winters. But cardinals used to be Southern birds. By the second half of the 20th century, though, they were nesting as far…

Hummingbirds such as this Buff-tailed Sicklebill specialize in nectar feeding. But other species of birds, less specialized to nectar, also visit flowers for a taste of the sweet stuff. The flowers they visit likely have a more open shape, with nectar more accessible to a non-specialist’s…

Boreal Chickadees live in the boreal forest year-round. How do they survive the harsh winter? First, during summer, they cache a great deal of food, both insects and seeds. Then in fall, they put on fresh, heavier plumage. And their feathers are denser than most birds', creating a comfy…

In the boreal forest, winter temperatures routinely drop to 30 degrees below zero. Birds that spend the winter in this harsh domain rely on remarkable adaptations to survive. The Spruce Grouse is one such bird. Most Spruce Grouse remain here all year. In the snow-free summer, they forage…

Los loros se encuentran entre las aves más inteligentes. ¿Pero son lo suficientemente astutos como para reconocerse entre sí por sus nombres? La investigación realizada por el ornitólogo Karl Berg sugiere que la respuesta podría ser sí. Los estudios de Berg sobre las cotorritas culiverde…

On the north Atlantic coast, a slate-gray sandpiper picks among the barnacles and mussels that encrust a jetty’s massive boulders. At the same moment, a parallel scene unfolds on the north Pacific Coast. A slate-colored sandpiper emerges from the salt spray to forage over a windswept jetty…

It's morning on the island of New Guinea, and the lowland forests erupt with the crowing calls of Birds-of-Paradise. Male Raggiana Birds-of-Paradise perform elaborate displays to attract females, sometimes even hanging upside-down with their wings pointing upward. Forty-three species of…

Great Horned Owls have a lot to say! When a pair of Great Horned Owls calls in a duet, the female usually hoots first, and the male replies at a lower pitch. Great Horned Owls may also pierce the darkness with an eerie shriek, which may signal a hungry owlet begging for food or a female…