Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
A dog's naked behind leaves absolutely no bacteria when pressed against carpet.
250
Dogs sometimes fake being sick to get attention.
26
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
271
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25