Of all the earth's animals, none is more fascinating than the whales, members of the order Cetacea. Although whales spend their lives in the sea, they are warm-blooded mammals. And just like land mammals, whale calves nurse on their mothers' milk.

One species of whale, the great Blue whale, is the largest creature that has ever lived. Larger than the largest of ancient dinosaurs, blue whales can grow to be more than 100 feet long and weigh more than 150 tons. Of course, not all whales are as large as the great blue. The Pilot whale, for example, grows to about 28 feet. And those popular members of the whale family, porpoises, range from 3 to 13 feet in length. To learn more about whales click on one of the links provided.