Why some animals still have a penis bone

A team of researchers affiliated with several institutions in the U.K. has found a possible explanation for why some animals still have a penis bone—"prolonged intromission." In their paper published in Proceedings of the ...

An intimate look at the mechanics of dolphin sex

Earth's creatures outwardly display an astonishing diversity of genitalia and mating behavior, but the intricate details of how genitalia interact during copulation has remained largely mysterious. In a new study, researchers ...

Ancestor of arthropods had the mouth of a penis worm

Imagine a meter long worm with 12 stubby legs and matching sets of flaps running down the body. On the head is a large pair of spiny appendages used for grasping prey that transport victims into a circular mouth with several ...

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