A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
Only 3% of bird species have penises.
0
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
Whales and dolphins can't taste anything other than salt.
11
Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
47