Imagine zooming out on a giant family tree that includes every bird you have ever seen. Ostriches sprint across open plains, hummingbirds hover at flowers, penguins slice through cold seas, and eagles ...

Avian enthusiasts around the world will identify and count birds from February 13 through February 16 as part of a massive ...

Researchers and volunteers in Texas documented birds of different species preening one another. Experts say the behavior may be more common than documented.

New research shows mountain birds move up and down slopes to save energy, find food, and avoid competition across seasons.