Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Cows can sleep standing up, but they can only dream lying down.
745
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6