Cats recognise the voice of their owner, but never evolved to care.
22
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
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
The elephant brain weighs about 6,000g.
274
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
On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
71