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 sea turtle's shell is a masterpiece. A study reveals that marine turtle shells combine flexibility and strength to protect against predators like sharks and stress while optimizing movement. This ...

Dr. Universe: Why can’t sea turtles pull back into their shell? I was at the St. Louis Zoo, and they said tortoises and other turtles can pull back into their shells. – Tyler, 7, Missouri There are ...

The biggest turtle ever described wasn’t an ancestor of today’s leatherback turtles or any other living sea turtles. But it looks like there are some things about being a giant, skin-shelled sea ...