Basically, a turtle's skeleton is inside out. And just like you can't take a skeleton out of a person, right, you can't take a turtle out of its shell either. But if you could, you'd probably be ...

The way that turtles evolved into their modern form, with a shell fused to their skeleton and a beaklike face without teeth, has been described as “one of evolution’s most enduring puzzles”.

One of the most distinctive features of turtles is their shell, which is actually part of their skeleton. The shell consists of two parts: the carapace (top) and the plastron (bottom). These parts ...