Daily briefing: Mammals probably evolved same-sex sexual behaviour several times

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    Daily briefing: Mammals probably evolved same-sex sexual behaviour several times


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    Nature | 7 min read

    Same-sex sexual behaviour probably evolved independently several times in mammals as a way to smooth out social relationships when they started living in groups. An analysis of more than 6,000 mammalian species found that about 4% exhibited same-sex behaviours — including courtship, mating and forming long-term bonds — and these were particularly prevalent in non-human primate species. The researchers caution that the findings can’t explain the evolution of sexual orientation in humans.

    The New York Times | 5 min read

    Reference: Nature Communications paper

    Circular phylogenetic tree showing the main mammalian families and prevalence of homosexual behaviour

    Same-sex sexual behaviour has been reported in 261 mammalian species, and males and females were equally likely to be observed engaging in it. (J.M. Gomez et al./Nat. Commun.)

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