Now this may sound odd, and it has nothing to do with poop*. When we were in Sydney, we took a tour of a nature sanctuary. We learned an interesting fact about. Sorry if I already said this. Both Koalas and Wombats' butts are caked with keratin, like our fingernails.
Koalas' butt keratin is curled up around their ass. They use this so they can sit and sleep in trees for long periods.
Wombat's butts are also built from keratin, but they are much flatter across their entire rear.
Wombats dig and sleep in burrows, and if a predator (like a dingo) comes after them, they shove their ass in the plug of the burrow and they are safe.
* I did say this wasn't about poop, but remember, wombats are the only animal with square poops. NASA is studying it. Really.
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