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
There are approximately three chickens for every human on Earth.
13
The reindeer is the only mammal that can see UV light.
17
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
The head of a jellyfish is called the "Bell."
6