Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
The Basenji dog is the only dog that is not able to bark.
4
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13
Cats lose almost as much fluid in the saliva while grooming themselves as they do through urination!
205
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23