A cell in the eye may be worth two in the beak, at least when it comes to a migratory bird’s magnetic compass. In European robins, a visual center in the brain and light-sensing cells in the eye ...

Birds' eyes are different from human eyes in several key ways, and researchers determined that blue light would be most conspicuous to the Brown-headed Cowbirds used in their study. Outfitting a ...

"Oxygen supply of the avian retina is a challenging task because birds have large eyes, thick retinas and high metabolic rates, but neither deep retinal nor superficial capillaries." To answer the ...