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Sea otter Mishka floating on her back with her front paws pressed against her face.

The Densest Fur of Any Animal On Earth: All About Sea Otters

How many hairs do you have on your head? Most humans have about 100,000, give or take a few. But sea otters have anywhere between 500,000 and 1,000,000 hairs per square inch of skin—meaning that one inch of a sea otter’s fur has between five and 10 times the number of hairs you have on your entire head!

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