Beneath the ocean’s surface lies a world teeming with creatures whose lives are as enigmatic as they are extraordinary. Among ...

Palolo worms must have one of the strangest life cycles in the animal kingdom, although there is plenty of competition.

The worms are thought to have been some of the largest swimming animals, when they roamed the seas more than 518 million years ago. Scientists think that the creatures were around for "about 10 to ...