Walruses have long tasks, up to a metre in length. They don t use them to capture prey, however, but to defend themselves against hungry polar bears, or to climb out of the water or over rocks. You can tell the age of a walrus by how light-coloured its skin has become and how long its tusks have grown. A walruss skin is 2 to 4 cm thick. Under it, walruses have an 8- to 10-cm-thick layer of fat.

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