The Basenji dog is the only dog that is not able to bark.
4
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45
An average cat has 1-8 kittens per litter and can have 2-3 litters per year. During her productive life, one female cat could have more than 100 kittens. A single pair of cats and their kittens can produce as many as 420,000 kittens in just 7 years.
10
Cats sleep for 70% of their lives.
8
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
A dog's naked behind leaves absolutely no bacteria when pressed against carpet.
250
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4