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
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Jellyfish as a species are actually older than dinosaurs and sharks.
383
A domestic cat can sprint at about 31 miles per hour.
274