Whales are mammals that live in the ocean.
Whales can be grouped into those that have teeth and a single blowhole, and those that have two blowholes. There are many different species of whales, differing in size and shape. The Blue Whale is the largest animal to have ever lived. It can be 100 feet in length and weigh 120 tons. Like other mammals, baby whales drink their mother's milk, which is rich in vitamins.