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Manatees (family Trichechidae, genus Trichechus) are large aquatic mammals sometimes known as sea cows. The Trichechidae differ from the Dugongidae in the shape of the skull and the shape of the tail. Manatees' tails are paddle-shaped, while the Dugong's is forked. It is an herbivore, spending most of its time grazing in shallow waters. |
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Walruses spend about half their time in the water and half their time on beaches or ice floes where they gather in large herds. They may spend several days at a stretch either on land or in the sea. In the sea they sometimes catch fish but generally graze along the sea bottom for clams which they suck from their shells. The walrus’s tusks serve to pry out shellfish from their beds. |
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The Harbour Porpoise (Phocoena phocoena) is one of six species of porpoise, and so one of about eighty cetacean species. The Harbour Porpoise, as its name implies, stays close to coastal areas or river estuaries and as such is the most familar porpoise to whale watchers. This porpoise often ventures up rivers and has been seen hundreds of miles from the sea. |
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The Polar Bear (Thalarctos maritimus or Ursus maritimus) is a large mammal of the order Carnivora, family Ursidae. It is a circumpolar species found in and around the Arctic Ocean. It is the world's largest land carnivore. Adult males weigh from 400 to 600 kilograms and occasionally exceed 800 kilograms. |
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Mammals 
