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Are there more homosexual individuals in ducks, humans, or some other species?

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  • $\begingroup$ 100% of male flour beetles are bisexual. $\endgroup$
    – user37019
    Commented Oct 4, 2017 at 20:00

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Homosexual behavior have been observed more than 1500 species (according to Museum of Natural History of the University of Oslo). A full comparison between all known species is far beyond the scope of this site, but below I discuss three species of interest. Also, the details of what counts as an homosexual behavior, and also whether you compute incidence or prevalence makes the whole discussion semantically complicated.

  • According to Simon Levay and Aldo Polani, in domesticated sheep, 10% of the rams (males) prefer mating with other rams than with ewes (females).

  • About 25% of black swans are homosexuals (Braithwaite, 1981).

  • In lions, 8% of the mounting is in between two males (Bagemihl 2000)

In humans, around 3%-5% of the surveyed people claim being homosexual or bi-sexual (see wiki > demographics of sexual orientation#Modern_survey_results).

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  • $\begingroup$ Any evidence (link) for the claim of the 1500? Otherwise nice answer! $\endgroup$
    – RHA
    Commented Oct 5, 2017 at 8:29
  • $\begingroup$ @RHA Reference added. I would not call it an evidence as it is not a peer reviewed paper though. Thank you $\endgroup$
    – Remi.b
    Commented Oct 5, 2017 at 17:05
  • $\begingroup$ Good enough (and +1), I just knew you hadn't made that number up yourself. $\endgroup$
    – RHA
    Commented Oct 5, 2017 at 17:38

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