Early American humans hunted car-size armadillos and used their shells for houses.
12
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Cows can sleep standing up, but they can only dream lying down.
745
Cats and dogs can hear ultrasound.
350
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
The oldest creature ever found was Ming the clam at an admirable 507 years old.
16
