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Two species of macaques from Kowloon in Hong Kong have learnt to live
together in one group and interpret each other’s gestures. Evolution and Ecology
of Macaque Societies, edited by John Fa and Donald Lindburg (Cambridge
University Press, £70/$125, ISBN 0 521 41680 9), is bang up to
date. An extraordinarily diverse genus, macaques are also the world’s most
widely distributed non-human primate.