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Human and chimpanzee skull. Coloured x-rays of the skulls of a human (homo sapien) and chimpanzee (Pans troglodytes). The cranium of the chimpanzee is considerably smaller than that of the human. Both consist of many spongy bones fused at sutures. Chimpanzees have prominent brow ridges above their eyes. The large mandible bone has powerful chewing muscles attached to it. Chimpanzees feed largely on fruit by grinding it down with their flat molar teeth. The human jaw also houses numerous teeth. Both humans and chimpanzees evolved from a common primate ancestor. This image could represent evolution. (KEYSTONE/SCIENCE PHOTO LIBRARY/D. ROBERTS)