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Published 13:16 5 May 2019 BST
Updated 18:04 5 May 2019 BST

“The link between food sharing and oxytocin found in chimpanzees may also be relevant for humans, where pro-social behaviour has often been linked to food sharing and provisioning.
“Long-lasting cooperative relationships have also been referred to as strong social bonds, which are characterised by high rates of cooperative behaviours, such as grooming and food sharing. “Crucially, there is evidence that individuals who maintain such cooperative relationships have more offspring than those who do not.”Well, good for them.
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