Page last updated at 15:49 GMT, Wednesday, 24 December 2008

Orangutans learn to trade favours

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Orangutans can help each other get food by trading tokens, scientists have discovered - but only if the help goes in both directions.

Researchers from the University of St Andrews found orangutans could learn the value of tokens and trade them, helping each other win bananas.

Christina McGourty reports.

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