Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Bats sleep 18-20 hours per day.
5
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20