Why Some People Are Gay: Notes (and Clues) from the Animal Kingdom
We have known for at least a decade that hundreds of animal species — including birds, reptiles, mollusks and, of course, humans — engage in same-gender sexual acts. But no one is quite sure why. After all, same-sex couplings don’t usually result in offspring. (I say usually because when male marine snails pair with other males, one partner conveniently changes sex, allowing for reproduction.) Evolutionarily speaking, homosexuality should have disappeared long ago.
A yearlong study just completed at the University of California at Riverside offers several fascinating competing theories about why same-gender sexual behavior has endured. And although it’s gay-pride month — and the 40th anniversary of the Stonewall riots that sparked the gay-rights movement — not all the theories will give same-gender-loving humans a reason to celebrate. (See the top 10 animal stories of 2007.)
One particularly charged finding is that in most species besides humans, same-gender pairings rarely lead to lifelong relationships. In other words, when one attractive bonobo male eyes another in a lovely patch of Congo swamp forest, they occasionally kiss and then move on to other oral pleasures, but they don’t bother anyone afterward about trying to legalize their right to an open-banana-bar ceremony. In fact, they are likely to move on to girl bonobos: most animals that engage in same-gender sex acts do so only when an opposite-sex partner is unavailable.
And yet the study’s authors, Nathan Bailey and Marlene Zuk of UC Riverside’s biology department, report some exceptions, like the laysan albatross. Last year, researchers studying a Hawaiian colony of albatrosses found that nearly a third of all the couples involved two females who courted and then shared parenting responsibilities. (Albatrosses don’t have U-Hauls, so no lesbian jokes, please.) Male chinstrap penguins also form long-term relationships, at least in captivity. And some male bighorn sheep will mount females only after the females adopt male-like behaviors.
What explains all these variances? Here are some hypotheses I collected from Bailey and Zuk’s paper as well as from some of their original sources:
See Why Some People Are Gay: Notes (and Clues) from the Animal Kingdom
TIME
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Homosexual behaviour widespread in animals according to new study
The pairing of same sex couples had previously been observed in more than 1,000 species including penguins, dolphins and primates.
However, in the latest study the authors claim the phenomenon is not only widespread but part of a necessary biological adaptation for the survival of the species.
They found that on the Hawaiian island of Oahu, almost a third of the Laysan albatross population is raised by pairs of two females because of the shortage of males. Through these ‘lesbian’ unions, Laysan albatross are flourishing. Their existence had been dwindling before the adaptation was noticed.
Other species form same-sex bonds for other reasons, they found. Dolphins have been known engage in same-sex interactions to facilitate group bonding while male-male pairings in locusts killed off the weaker males.
A pair of “gay” penguins recently hatched an egg at a German zoo after being given the egg that had been rejected by its biological parents by keepers.
Writing in Trends in Ecology & Evolution, Dr Nathan Bailey, an evolutionary biologist at California University, said previous studies have failed to consider the evolutionary consequences of homosexuality.
He said same homosexual behaviour was often a product of natural selection to further the survival of the species.
See
Homosexual behaviour widespread in animals according to new study
Telegraph.co.uk
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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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