JOHN READER / SCIENCE PHOTO LIBRARY JOHN READER / SCIENCE PHOTO LIBRARY
Chimpanzees (Pan troglodytes). The chimp in the foreground is using two rocks as a hammer and anvil to break open a nut. The use of tools is rare in animals and is considered a sign of intelligence. The chimpanzee inhabits forests and forest edges in central and western Africa. It lives in large social communities of up to 100 animals, divided loosely into family groups. The chimp is omnivorous, feeding on fruits, leaves and buds as well as insects, monkeys and even small antelopes. The male is larger than the female, and may reach up to 120 centimetres in height.
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