The cat brain weighs about 30g.
167
Dolphins have names for one another.
18
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
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
Sharks, like other fish, have their reproductive organs in their chests.
248