Cartoons often suggest turtles wear shells like removable armor. Those stories show turtles stepping out, swapping shells, or ...

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

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 ...

Turtles today are often slow-moving, modestly sized creatures, but their ancient relatives were quite different. Long before ...