When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The colossal squid has the largest eyes in the world.
4
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45
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
Dogs have been man's pet for over 14,000 years.
224