Dogs have been man's pet for over 14,000 years.
224
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Cows can sleep standing up, but they can only dream lying down.
745
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
Female kangaroos have three vaginas.
2
Cats sleep for 70% of their lives.
8
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13