When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
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
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10