The reindeer is the only mammal that can see UV light.
17
The oldest creature ever found was Ming the clam at an admirable 507 years old.
16
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
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
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7