Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Mosquitoes don't just bite you, they also pee on you.
11
The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
476
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
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
20 minutes after smoking a cigarette, blood pressure drops to normal.
37
Your body is creating and killing about 2.4 million red blood cells per second.
17
Lobsters have blue blood.
476