Cows can sleep standing up, but they can only dream lying down.
745
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Sharks have been on the planet longer than trees.
14
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
A dog's naked behind leaves absolutely no bacteria when pressed against carpet.
250
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10