Cows can sleep standing up, but they can only dream lying down.
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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
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
There's a rare breed of pig that looks like a sheep.
14
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
Early American humans hunted car-size armadillos and used their shells for houses.
12
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