An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
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
Rattlesnake mating sessions have been known to last more than 22 hours.
232
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
Cats recognise the voice of their owner, but never evolved to care.
22
Sheep, goats, octopuses, and toads have rectangular pupils.
7