Female elephants spend their entire lives living in large groups called herds. Male elephant leave their herds at about 13 years old and live fairly solitary lives from this point.

A baby whale is called a calf. Whales form groups to look after calves and feed together. These groups are often made up of all female or all male whales.

There is enough concrete in the Hoover Dam to pave a two lane highway from San Francisco to New York.

AMAZING FACTS