Reproduction

Researchers found these dusty clumps of green and brown may be hiding how they get it on.

The small-winged stick mantis is found throughout South America's grasslands. But in Uruguay, the population is entirely female.

From penis dueling to pee potions to switching sexes, there’s no one right way of getting it on in the ocean.

The mating calls of black drum fish might be the source of Tampa's mysterious thumping bass.

Lightning and other environmental electricity may jumpstart reproduction for the Amazon Basin fish.

Tenerife's Playa de las Teresitas attracts tourists looking for sun—and endangered angelsharks.

For some species, mating season means detachable penises, urine-based perfumes, and ear-splitting declarations of love.

Scientists fitted the famously bitey marsupials with tiny accelerometers to learn their secrets.

Scientists hatch a bold plan to save Brazil's critically endangered golden lancehead, which lives on a single infamous isle.

In 1981, Helene Marsh and her mentor discovered the truth about a basic biological process—but it took many researchers years to accept it.

As birds go, these Australian animals are unusual in many ways, including how they divvy up parenting duties.

Discovering the trait may help scientists protect the tuatara, which has been around since the dinosaurs.

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Before the birds moved in together, they had to learn to "howdy."

Too many El Niños have diminished the "diablo rojo."

Doctors wrote recipes to cure patients' ailments and determine the sex of their children.