Whale are big mammals which live in the sea. A thick layer of fat called blubber keeps out yhe cold. A whale’s boy is shaped for easy swimming. It’s front limbs are shaped as flippers. It also has a broad tail flattened from top to bottom, not from side to side like a fish tail.
Unlike fishes, whales must swim to the surface to breath. Before breathing in, they blow out stale air though a blowhole, or two slits on top of the head. Baby whales are born on water. As soon as they are born, they swim up to take a breath.
There are two group of whales toothed whales, like the dolphin mostly catch fish. But killer whales are toothed whales thet attack seals, penguins, and other whales.
Ballen whales are the other main group of whales. Baleen whales include the gigantic blue whake. Each baleen whale cathes tiny shrimp like creatures with a special sieve. this is made of a horny substances called baleen or whale bone. When the opens its mounth, long bakeens plates hang from its upper jaw like the teeth of a giant comb. A large whale can swallow over a tone of these tiny krill at one time. Hunting by men has made biggest whales very scarce.
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