The rhesus macaques on Cayo Santiago that engaged in same-sex behavior were also found to have more babies, indicating an evolutionary advantage.
Male rhesus monkeys on a tiny island in Puerto Rico have more sex with each other than they do with females, scientists have discovered. This behavior may be partially rooted in genetics, the team said.
In the 1930s, scientists founded a monkey colony on the small island of Cayo Santiago in Puerto Rico for research purposes. Known locally as Monkey Island, it now has over 1,700 rhesus macaques living freely there. In a study published Monday in the journal Nature Ecology and Evolution, researchers were looking at same-sex behavior among males on the island — and found it was extremely common among the 236 male monkeys they observed.
"We find this behavior between males helps them form coalitions — when they bond by having sex, they fight together against other males [that they are not having sex with]," Savolainen said."As a result, they probably get an advantage in the group, access more females and end up having more babies."
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