Bats sleep 18-20 hours per day.
5
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
The reindeer is the only mammal that can see UV light.
17
A puppy is born blind, deaf, and toothless.
16
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Whales and dolphins can't taste anything other than salt.
11