The Whales
Whales are sea living mammals. They therefore breathe air but cannot survive on land. Some species are very large indeed and the blue whale, which can exceed 30 meters in langth, is the largest animal to have lived on earth. Superficially, the whale looks rather like a fish, but there are important differences in its external structure; its tail consist of a pair of broad, flat horizontal paddels (the tail of a fish is vertical), and it has a single nostril on top of its large, broad head. The skin is smooth and shiny and beneath it lies a layer of fat (blubber). It can be up to 30 meters in thignes and serves to conserve heat and body fluids.
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