Researchers may have just found the answer: Unlike birds, the evolution of bats' wings and legs is tightly coupled, which may have prevented them from filling as many ecological niches as birds.

The bird count helps “scientists better understand and protect birds around the world,” according to birdcount.org. The four-day event runs Feb. 16-19. Birdwatchers are encouraged to pick one ...

A new study (ref) suggests that being born in captivity can affect more than behavior: it can also change morphology, such as the shape or length of a bird’s wings. Bird wing shape is critical ...