Cows can sleep standing up, but they can only dream lying down.
745
Sharks, like other fish, have their reproductive organs in their chests.
248
A puppy is born blind, deaf, and toothless.
16
Sharks have been on the planet longer than trees.
14
Early American humans hunted car-size armadillos and used their shells for houses.
12
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
When dragonflies mate, their tails form a love heart.
22