Here are 10 animals that have some of the highest levels of testosterone and the impact it has on their behavior and characteristics.

Humans don’t have a defined mating season like deer or wolves. Here’s how evolution blended biology, culture and social life into year-round intimacy.

In the movie Hoppers, scientists “hop” human consciousness into animal-like robots to talk to other species. We asked the ...

Scientists suggest female frogs listen for changes in the male calls as a signal for when it's warm enough to mate.

Kakapos, which are reclusive and flightless and can live as long as humans, are found only in New Zealand. They feed on the fruit of the rimu tree.

Animals are noisy. And their noises can travel a long way. But making sounds can be a double-edged sword: it can help them communicate, sometimes over long distances, but it can also reveal them to ...

Researchers say seven seal pups have tested positive for an avian flu virus at California’s Año Nuevo State Park and several ...

The experiment began with a straightforward prediction: microbes from older mice would age young ovaries. But when the ...

In the warm, humid savannahs and forests of sub-Saharan Africa dwells a tribe of flower beetles in the genus Golianthus, ...

Scientists discover hedgehogs hear ultrasound, opening the possibility of warning sounds that keep them away from roads.

Ancient linkups may have happened more frequently between female humans and male Neanderthals, according to an new genetic ...

The 2010 discovery that early humans and Neanderthals once encountered one another and had babies was a scientific bombshell that electrified the field of human origins. Now, geneticists at the ...