Animal Sex

From an evolutionary and biological perspective, animals are driven to have sex in order to procreate. But there is a lot more to sexual relations between animals. Animal sex is at least as strange and varied as human sex. A male might copulate with many females. And female animals of many species can be choosy, too. Homosexuality is common. Monogamy is rare. And the animal kingdom is full of swingers. In short, with animals, sex can be wild.
Read More
Animal Sex: How Koalas Do It
Koala bears sleeping up in the trees.
June 29th, 2014
Koalas may be cute and cuddly, sleeping 18 to 22 hours a day, but they can become vicious when it's time to get down to business. Here's a look at how the marsupials mate.
Read More »
Ant Sperm Bundle Up to Outrace the Competition
Sperm bundles of the desert ant <em>Cataglyphis savignyi</em>.
June 10th, 2014
The sperm of the desert ant Cataglyphis savignyi swim in bundles, a rare example of sperm cooperation. The teamwork boosts the swimming speed of the sperm, potentially providing a reproductive advantage.
Read More »
How Corkscrew Vaginas and Female Penises Evolved
Menno Schilthuizen, author of "Nature's Nether Regions" (Viking, 2014), looks at saki monkeys at the Prospect Park Zoo.
May 10th, 2014
The animal world contains an amazing diversity of genitalia that has been largely unappreciated, even among scientists. Live Science goes to the zoo with author Menno Schilthuizen to talk about the sex lives of ducks, cave insects and humans.
Read More »
Brown Bears Caught Performing Oral Sex
June 17th, 2014
The club of fellatio-loving animals just gained a new member: bears. Scientists have observed a pair of male brown bears in captivity in Croatia that regularly engaged in oral sex over several years.
Read More »
The First Vertebrate Sexual Organs Evolved as an Extra Pair of Legs
placoderm, fish sex
June 10th, 2014
We humans use the euphemism for sex that “we like to get a leg over” but the first jawed vertebrates – the placoderms – they liked to get a leg in.
Read More »
Animal Sex: How Sea Turtles Do It
Mating green sea turtles (Chelonia mydas) in the Galapagos Islands.
May 5th, 2014
During mating, the male sea turtle will reach his tail underneath the back end of the female's shell. His long penis, which can be almost half the length of his shell, will emerge from his cloaca to penetrate and inseminate the female's cloaca.
Read More »
Motherless Male Zebra Finches Prefer Same-Sex Mates
zebra finches
June 17th, 2014
Male zebra finches prefer to form lifelong pair bonds with other males if they're raised by their dad alone, new research shows. This mate choice is likely the result of males "imprinting" on their fathers, researchers say.
Read More »
Animal Sex: How Jellyfish Do It
a pair of jellyfish mating.
May 29th, 2014
Jellyfish mating involves courtship dances, swamps of reproductive material and buds, or tiny clonal outgrowths.
Read More »
Animal Sex: How Elephants Do It
A pair of elephants with one resting his head and trunk on the back of the other.
April 19th, 2014
Despite some human-like characteristics, elephants' mating behaviors are very different from our own.
Read More »