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 their sternum. Basically, a turtle's ...

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 ...

Travel back in time to 260 million years ago, just before the dawn of the dinosaur era. Journey to what is now South Africa, and make your way to a river bank. Then, wait. If you’re lucky, you might ...