Animal Trivia : A small whale is called a dolphin.

A small whale is called a dolphin.

 

There is no difference between dolphins and whales on the creature classification. 

Whales and dolphins are mammals that belong to the order cetacea, which also includes porpoises. 

The dolphin is the same kind with the toothed whale such as sperm whale.　

The dolphin also blows as well as the whale. 

By the way, a land-dwelling creature that is the most close to a dolphin and a whale is a hippopotamus.