Are there more homosexual individuals in ducks, humans, or some other species?
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100% of male flour beetles are bisexual. – user37019 Oct 04 '17 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).
Remi.b
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@RHA Reference added. I would not call it an evidence as it is not a peer reviewed paper though. Thank you – Remi.b Oct 05 '17 at 17:05
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Good enough (and +1), I just knew you hadn't made that number up yourself. – RHA Oct 05 '17 at 17:38