When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Only 3% of bird species have penises.
0
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13
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
When cats are happy, they may squeeze their eyes shut.
10