If optimists see the world through rose-colored lenses, some birds see it through ultraviolet ones. Avians have evolved ultraviolet vision quite a few times in history, a new study finds. Birds depend ...

Males of two species of pheasants seem to trade attractiveness for the ability to get a good look at predators. By Jack Tamisiea To woo mates, male golden pheasants are dressed to impress. The game ...

Structures and functions of bird’s eye. (a) Bird vision. (b) Deep central fovea and four types of cones. (c) Foveated vision and tetrachromatic vision. The eyes of raptors such as eagles can ...