List of animals displaying homosexual behavior

So, even though asexual whiptail lizards populations lack males, sexual stimuli still increase reproductive success. Certain species of gecko also reproduce by parthenogenesis.

Are there any homosexual animals?

Some species of sexually reproducing geckos have been found to display homosexual behavior, e. Jonathan , the world's oldest tortoise an Aldabra giant tortoise , had been mating with another tortoise named Frederica since In , it was discovered that Frederica was actually probably male all along, and was renamed Frederic.

There is evidence of same-sex sexual behavior in at least species of insects and arachnids. SSS behavior is often shorter than the equivalent heterosexual behavior. Scharf et al. Yet, this list lacks detailed descriptions, and a more comprehensive summary of its prevalence in invertebrates, as well as ethology, causes, implications, and evolution of this behavior, remains lacking". Male homosexuality has been inferred in several species of dragonflies the order Odonata. The cloacal pinchers of male damselflies and dragonflies inflict characteristic head damage to females during sex.

Male Drosophila melanogaster flies bearing two copies of a mutant allele in the fruitless gene court and attempt to mate exclusively with other males. Male bed bugs Cimex lectularius are sexually attracted to any newly fed individual and this results in homosexual mounting.

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This occurs in heterosexual mounting by the traumatic insemination in which the male pierces the female abdomen with his needle-like penis. In homosexual mating this risks abdominal injuries as males lack the female counteradaptive spermalege structure. Males produce alarm pheromones to reduce such homosexual mating. From Wikipedia, the free encyclopedia. For homosexuality in humans, see Homosexuality. See also: Seabird same-sex pairing and Seabird breeding behavior: Same-sex pairing. Main article: Further information: Play media.

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Olympic marmot left and Hoary marmot right. Sexual behavior of lions. Animals portal LGBT portal. Against Nature?

Biology and sexual orientation Cross species sex Freemartin Hermaphroditism in animals Homosexuality and psychology Innate bisexuality List of animals displaying homosexual behavior Non-human primate experiments Norms of reaction Plant sexuality Sexual orientation Sexual orientation and medicine disambiguation Xq Australian Natural History. Retrieved 25 March Retrieved National Institute of Water and Atmospheric Research. Archived from the original on 13 July Queer Science: The Use and Abuse of Research into Homosexuality.

Cambridge, Massachusetts: MIT Press. Dixson Animal Homosexuality: A Biosocial Perspective. Cambridge University Press. This makes O.

Homosexual behavior in animals - Wikipedia

Oxford University Press. Biological Exuberance: New York City: Martin's Press. Homosexual behavior occurs in more than different kinds of animals worldwide, and is found in every major geographic region and every major animal group. Reprinted in Jahrbuch fur sexuelle Zwischenstufen 7 , pp. American Scientist.

Diversity, gender and sexuality in nature and people , University of California Press , Berkeley, ; pp. A review of evidence and theory". International Journal of Primatology. Cambridge University Press , Cambridge. The power of same-sex liaisons". New Scientist. April The New York Times. Animal Homosexuality and Natural Diversity. New York: New York, New York: Homosexual Behavior In Animals: An Evolutionary Perspective. Cambridge Press. Hystrix It. Archived from the original on May 28, Natural History Museum, University of Oslo. February Retrieved October 6, Fox News.

African Ungulates: Springer Verlag , Berlin, cited in Biological Exuberance: Deutsche Welle. CBC News. Resko; John N. Stellflug; Fred Stormshak Archived from the original on Society for Science and the Public. The Telegraph. BioMed Central. The Scientific Fascination with Queer Animals". A Journal of Lesbian and Gay Studies. BBC News. Natural History. Biology Letters. Proceedings of the Royal Society B. Anatidae " PDF. Retrieved 6 October They're gay.

They're penguins And they're not alone". Columbia University. Columbia News Service. June 10, Archived from the original on January 23, Huffington Post. November 11, November 9, San Francisco Chronicle.

March View image of Japanese macaques Macaca fuscata mating Credit: Animals have been observed engaging in same-sex matings for decades. But for most of that time, the documented cases were largely seen as anomalies or curiosities. The turning point was Bruce Bagemihl's book Biological Exuberance , which outlined so many examples, from so many different species, that the topic moved to centre stage.

Since then, scientists have studied these behaviours systematically. Despite Bagemihl's roster of examples, homosexual behaviour still seems to be a rarity. We have probably missed some examples, as in many species males and females look pretty much alike. But while hundreds of species have been documented doing it on isolated occasions, only a handful have made it a habitual part of their lives, says Vasey.

To many, that isn't surprising. On the face of it, homosexual behaviour by animals looks like a really bad idea. Darwin's theory of evolution by natural selection implies that genes have to get themselves passed on to the next generation, or they will die out. Any genes that make an animal more likely to engage in same-sex matings would be less likely to get passed on than genes pushing for heterosexual pairings, so homosexuality ought to quickly die out. But that evidently isn't what's happening.

For some animals, homosexual behaviour isn't an occasional event — which we might put down to simple mistakes — but a regular thing.

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Are there any homosexual animals?

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