Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
A blue whale's aorta (the main blood vessel) is large enough for a human to crawl through.
52
Polar bear fur is not white, it's clear.
74
Most elephants weigh less than a blue whale's tongue.
442
A duck's quack doesn't echo, and no one knows why.
173
Worker bees must visit around 4,000 flowers in order to make one tablespoon of honey.
5
All species of beetles are edible.
21