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
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
Cats and dogs can hear ultrasound.
350
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
Cats sleep for 70% of their lives.
8
Dogs sometimes fake being sick to get attention.
26