Many seals, such as the leopard seal shown below, live in very cold conditions. Fur is good at keeping land mammals warm, but it stops doing this when it gets very wet. However, fat will keep an animal warm in or out of the water. This is why seals have a thick layer of fat, called blubber, which lies beneath their skin. | | A leopard seal chases penguins through the cold waters of the Antarctic. |
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