What’s Inside A Turtle Shell?

A turtle can’t crawl out of its shell. In fact, the shell is actually part of a turtle’s skeleton, as much of our ribcage is of ours. But if you could peer inside a shell, you’d find some of the most unusual features in the animal kingdom, such as a butt - err, cloaca - that some species use to breathe underwater.
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What’s Inside A Turtle Shell?