A grey whale and her calf swim in waters near Mexico. Soon they will set off on their long migration journey back to the Arctic...Read More >>A grey whale and her calf swim in waters near Mexico. Soon they will set off on their long migration journey back to the Arctic Ocean. Whales are ocean-living mammals that live permanently in the water. Together with dolphins and porpoises, they make up the group of mammals called cetaceans. Whales have a long, streamlined shape with no hair or fur on their bodies, so that they can swim quickly and easily. Instead of four legs, they have a tail, called a fluke, and flippers. Whales have a thick layer of fat under their skins, called blubber, to keep them warm in cold waters. As air-breathing mammals, whales have to come to the surface of the water to breathe air. They have excellent hearing, but a poor sense of smell. There are two types of whale: toothed whales and baleen whales.
Blue whale, worldwide, up to 30 m (100 ft) longWhales are the largest animals in the world. In fact, the enormous blue whale, which can measure over 30 metres (100 feet) long, is probably the biggest animal that has ever lived. Whales are able to grow so large because their huge weight is supported by the water. If a land animal grew to this size, its legs would collapse under the weight of its own body.
Despite their names, the killer whale and pilot whale are considered to be dolphins rather than whales.
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