The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
The elephant brain weighs about 6,000g.
274
A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
12
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Rex the German Shepherd was a rescue dog with a bad temper. He refused to be fed by humans and would attack strangers, but he’s a changed dog after falling in love with Geraldine the goose!
10
In Australia, there are spiders big enough to eat snakes.
20