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HUMAN EVOLUTION Human beings are unusual in being the only living species representing an entire biological family, the hominidae or hominids. The human species is exceptionally widespread, having colonised most land masses of the world (Harrison & Weiner 1982). Although closely related to the great apes such as the gorilla and chimpanzee, humans are distinct from them all and all other mammals in many important features. These include bipedal locomotion (walking on two legs) and the large size of the brain in relation to the body (BBC 2002). Humans are marked out even more by behaviour, in particular the great dependence on learning passed on from generation to generation, mainly through speech or signing (Birkett 1992). To investigate the origins and evolution of humans we need to study our early ape ancestors. It is generally believed that we separated for the apes around 6-8 million years ago. There is very little...

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