A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
In order to enhance the taste, Japanese macaque wash their food in salt water before they eat. They also make snowballs for fun!
7
A group of kittens is called a "kindle".
10
Two dogs were among the Titanic survivors.
262
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12