Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
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
Penguins have a gland above their eye that turns saltwater into freshwater.
12
When you shave a guinea pig it looks like a little hippo.
19
The oldest creature ever found was Ming the clam at an admirable 507 years old.
16
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217