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.

MORE ANIMAL SCIENCE CONTENT:
Why Cities Have So Many Pigeons
https://www.youtube.com/watch?v=WWFnOlMKpxk
The Most Extreme Milk In The Animal Kingdom
https://www.youtube.com/watch?v=CbBgcs9NYLE
Why Fruit Flies Are So Hard To Kill
https://www.youtube.com/watch?v=-O9K3TdejJs

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What’s Inside A Turtle Shell?