Lock eyes with a chimpanzee, and you will notice something is missing. The tissue surrounding their iris, called the sclera, is a deep brown or nearly black. You cannot easily tell where they are ...

Studies have shown that a dark ring around the iris of the eye is attractive, but psychologists remain unsure what causes the ...

Long believed to be a uniquely human trait crucial for communication, visible white sclera—the "whites of the eye"—occur more commonly in chimpanzees and other mammals than previously reported, finds ...

Add Yahoo as a preferred source to see more of our stories on Google. The white part of our eyes is known as the sclera. Blue, green, amber: Someone’s eye color immediately attracts our attention. But ...

Rachael has a degree in Zoology from the University of Southampton, and specializes in animal behavior, evolution, palaeontology, and the environment.View full profile Rachael has a degree in Zoology ...