Turtle shells evolved over the course of 300 million years, but self-defense wasn't the initial driver, researchers think.

In cartoons, when a turtle is spooked, it retreats into and closes up its shell. While used for comic effect, this imagery is based in fact — although not all turtles are capable of this protective ...

When we picture sea turtles in the wild, it’s easy to envision them as armored warriors – their hard, resilient shells serving as near-impenetrable shields against oceanic threats like sharks. These ...