A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
Cows can sleep standing up, but they can only dream lying down.
745
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
2