Male rhesus macaques often have sex with each other – a trait they have inherited in part from their parents

By Jackson Clive, Postdoctoral Researcher, Imperial College London
Ewan Flintham, Postdoctoral Researcher, Université de Lausanne
Vincent Savolainen, Professor of Organismic Biology, Imperial College London

Homosexual behaviour is not limited to humans. Biologists have reported homosexual behaviour in many species of wild animal, ranging from bats and birds to dolphins and primates.

When animals engage in homosexual behaviour, one might assume that they invest less time and energy on reproduction.…

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