Sheep, goats, octopuses, and toads have rectangular pupils.
7
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A group of kittens is called a "kindle".
10
Sloths take two weeks to digest their food.
243
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
40
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109