[Source: Medical News Today]

In a new study, investigators at the University of Pennsylvania in Philadelphia turned to rhesus macaques to investigate the effects of two hormones — oxytocin and vasopressin — on social behavior.

These primates are known for their aggressive, competitive behavior in groups that are highly hierarchized — which typically split members between dominant and submissive individuals.

But rhesus macaques were also chosen for another reason; according to the researchers involved in the recent study, these primates — like humans — live in large social groups, form long-term connections, and present some similar social behaviors.

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