The largest earthworm on record was found in South Africa and measured 22 feet.
151
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
When dragonflies mate, their tails form a love heart.
22
Sharks, like other fish, have their reproductive organs in their chests.
248