Lobsters have blue blood.
476
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Early American humans hunted car-size armadillos and used their shells for houses.
12
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Only 3% of bird species have penises.
0
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12