Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
Sloths take two weeks to digest their food.
243
Whales and dolphins can't taste anything other than salt.
11
Jellyfish as a species are actually older than dinosaurs and sharks.
383