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 ...

This one-ton turtle once ruled South America’s rivers — until a changing planet proved too much for even the largest ...

The fossilized remains of a bizarre-looking reptile are giving scientists new insights into how turtles got their distinctive shells. Some 240 million years ago, this early turtle-like creature lived ...