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 ...

A 260 million-year-old fossil has been determined to be the oldest ancestor of turtles found to date, revealing something about the reptile's mysterious past. Michelle Starr is CNET's science editor, ...

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 ...