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The discovery, made by neurobiologists at Duke University in Durham, North
Carolina, supports the theory that monkeys will make sacrifices to gain
socially useful information, much as a human might spend money on a
newspaper.
Male monkeys will 'pay' in fruit juice to look at a picture of a socially
dominant monkey or a female's hindquarters. In the wild, the animals help
their fitness by monitoring what their leaders are doing, and which females
are sexually receptive.
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