Gay animals may help species survive, scientists claim

More than 450 species of animals display gay behaviour, scientists have found.

In a paper, Trends in Ecology and Evolution, they suggested that homosexuality among animals may be vital for the survival of the species.

“The variety and ubiquity of same-sex sexual behaviour in animals is impressive,” wrote the paper’s authors Nathan Bailey and Marlene Zuk. “Many thousands of instances of same-sex courtship, pair bonding and copulation have been observed in a wide range of species, including mammals, birds, reptiles, amphibians, insects, molluscs and nematodes.”

“It’s been observed a lot,” Bailey, a post-doctoral researcher at University of California, Riverside continued. “But it took people a long time to put it in an evolutionary context.”

For traditional Darwinism, the notion of animals indulging in behaviour that will not result in procreation may seem confounding. However, Bailey and Zuk have argued that in many cases, gay behaviour in fact supports a species and can improve the chances of survival.

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Gay as a goose? Nearly all animals engage in same-sex behavior

We’re Deer. We’re Queer. Get Used to It.

Homosexuality in humans is a hot-button issue that gets plenty of coverage, but same-gender sex in animals rarely makes headlines. The organizers of a new Norwegian exhibition on homosexual behavior in the animal kingdom hope to call attention to the often ignored subject.

“People always come up with the argument that homosexuality is somehow against nature. And that’s not true,” said Petter Bøckman, the academic advisor for the “Against Nature?” exhibition at the Norwegian Natural History Museum of the University of Oslo.

Through models, photos, texts, and specimens ranging in size from tiny insects to enormous sperm whales, visitors can learn about a small selection of gay animals.

Scientists have observed homosexual behavior in 1,500 animal species, said Bøckman. Take, for instance, bonobos, one of our closest relatives and perhaps the most well-known homosexual animals. “They’re known to be rampantly bisexual,” he said. Killer whales, bottlenose dolphins, West Indian manatees, and giraffes have all-male orgies. Among black-headed gulls, scientists estimate that one in ten pairs is comprised of two females. Same-sex penguin couples have been known to have long relationships and raise chicks.

Homosexuality is most widespread among animals with a complex herd life. It functions as a kind of social glue for bonobos, who use sex to diffuse conflict—a marked difference from other primates that solve conflicts with violence. Homosexuality also plays a social role among other male animals, such as big horn sheep and lions.

But researchers have no idea what the advantage is, if any, of homosexual behavior among dragonflies, scarab beetles, or, as observed at least once, two male octopuses of different species. See We’re Deer. We’re Queer. Get Used to It.
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