WILDLIFE DISCOVERY : Whales: The biggest animals alive

Whales are large, magnificent, intelligent, mammals that live in water. They belong to a group of mammals called Cetaceans. These include whales, dolphins, and porpoises. Whales are not fish but are mammals because like all mammals, they breathe air into lungs, have hair, are warm-blooded, have mammary glands with which they nourish their young and have a four-chambered heart.
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