What mammal has the thickest fur?


Quick Answer

Sea otters have the densest fur of any mammal, with the ability to sport as many as 1 million hairs per square inch of fur, and as many as 800 million hairs covering its body. This thick fur is made up of a combination of short undercoat hairs and longer fur made up of what are known as guard hairs, which may be lighter in color than the undercoat.

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What mammal has the thickest fur?
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Full Answer

This fur is perfect for the sea otter, which spends a lot of time in cold water but, as a warm-blooded animal, must stay warm. The sea otter's dense fur helps to insulate the animal's skin by trapping air inside the hairs, forming a protective layer of insulation around the skin. Other marine mammals have a layer of blubber that helps them stay warm, but otters lack that layer of fat and must rely on their thick fur.

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