Snails can hide in their shells for months or even years, slowing metabolism and sealing in moisture to survive harsh ...

A pearl does not begin as something precious. It begins as a problem. Inside an oyster, a tiny particle slips in and settles ...

It's a long-held idea that turtles can tuck their heads into their shells when threatened. But is it true? And is this protective trick why turtles the world over have shells today? The answer is that ...