Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
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
Only 3% of bird species have penises.
0
When dragonflies mate, their tails form a love heart.
22
A giraffe's kick is so powerful that it can decapitate a lion.
216
Two dogs were among the Titanic survivors.
262
Tigers can see 6 times better at night than humans.
305
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25