Male or female? Sex identity among animals is less cut and dry than you might think.

This tiny beetle is as small as unicellular organisms! How does it manage to fit all the structures it needs to survive into such a miniscule body?

Researchers have found that there may be some truth to the perception that women are attracted to “bad boys,” but maybe not for the reasons you might think.

The same genes used for growing legs in reptiles and mammals perform a very different function in snakes.

Scientists have discovered the brain regions in male mammals that control the Jekyll/Hyde-like transition from killing offspring to caring for them.

A captive yellow-bellied snake has given birth for the second year in a row, despite having no male contact for eight years.

When male mice go cruising for chicks, they croon at ultrasonic frequencies — and it turns out that females accept their offers by joining in a duet.