The small eyes are usually dark brown. Gorillas have 32 teeth. The canines are strongly developed, and the male's canines are much larger than the female's. The molars are quite large to process the amount of vegetation gorillas eat. Adult gorillas lack hair on the fingers, the soles of the hands and feet, and armpits.
Hair is sparse on the upper chest, especially on older males.
The skin of a gorilla is dark and covered with black to reddish-brown hair. As the animals mature, the hair turns gray. Males acquire silver-gray saddles across their backs and upper thighs at sexual maturity, earning them the name silverback. Newborns initially have pinkish-gray skin which quickly darkens. They frequently have a white rump patch until a few years old.