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
Drivers kill more deer than hunters do.
660
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Penguins have a gland above their eye that turns saltwater into freshwater.
12