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January 24 2013
Scientists have provided insight into why unrelated chimpanzees co-operate with each other outside a sexual relationship.
The team of international researchers found that increased levels of the hormone oxytocin played an intrinsic role in non-kin co-operation.
Wild chimps that had taken part in a grooming session with a "bond partner" had higher levels of the hormone in their urine than after grooming with a "non-bond partner", irrespective of whether the individuals were related.
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