Dolphins have names for one another.
18
A group of kittens is called a "kindle".
10
The elephant brain weighs about 6,000g.
274
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20