There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
When dragonflies mate, their tails form a love heart.
22
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
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
It has been estimated that a bite from a grizzly bear can crush a bowling ball.
11
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13