Eli5 why animals can lick their butts and not worry about disease

Question

Eli5 why animals can lick their butts and not worry about disease

In: 12

Answer 1

Beavers eat their own turds, to have a second go at the fibre they just ate. Kind of like what cows do, but without multi stomachs.

Also, beavers arses leak the stuff in aspirin tablets.

Seem to me these are connected facts