When cats are happy, they may squeeze their eyes shut.
10
Cows can sleep standing up, but they can only dream lying down.
745
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
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
Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
47
There are approximately three chickens for every human on Earth.
13