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 ...

CONSIDER the floating fortress that is a sea turtle. It seems to fly gracefully through the water even though it is encased in heavy armour. This combination of poise and protection evolved like any ...

Turtle shells evolved over the course of 300 million years, but self-defense wasn't the initial driver, researchers think. When you purchase through links on our site, we may earn an affiliate ...