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
The seahorse is the only fish to have a neck.
12
Only 3% of bird species have penises.
0
When you shave a guinea pig it looks like a little hippo.
19
The octopus does not have a blind spot.
273
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12