Following is a transcript of the video. Narrator: A turtle's shell is as much a part of its body as our rib cage is of ours. In fact, it is their rib cage, and their spine, and their vertebrae, and ...

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 ...

Shells provide good protection for turtles, but that may not be why those shells originally formed. Denver paleontologist Tyler Lyson says the shells evolved because the turtles' ancestors, ancient ...