It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Your heart will pump about 212 million liters in its lifetime.
26
Your body is creating and killing about 2.4 million red blood cells per second.
17
Mosquitoes don't just bite you, they also pee on you.
11
Consumption of TNT turns urine amber or deep red, which people often mistake for blood.
301
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
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
Lobsters have blue blood.
476