Early American humans hunted car-size armadillos and used their shells for houses.
12
The cat brain weighs about 30g.
167
A group of kittens is called a "kindle".
10
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Cats sleep for 70% of their lives.
8
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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