Humans have white around their irises, whereas chimpanzees usually have a dark brown color. This makes it easier to see where other humans are looking, and there are several theories as to why this is so. It may be an adaption to more complex social situations, where it is an advantage to see whom others are looking at and thinking about.Or it may simply be a genetic mutation with no purpose – white around the iris is seen in some chimpanzees also. Both humans and chimpanzees can see in color, helping them to choose ripe fruits and plants to eat, and have binocular vision; their eyes point forward in the same direction. This helps see in depth and is crucial to hunting, rather than eyes on the side of the head like rabbits which help avoid being hunted.