A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Vanilla flavoring is sometimes made with an ingredient from beaver pee.
82
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
The elephant brain weighs about 6,000g.
274