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9 nearly hairless mammals

By: Bryan Nelson on Nov. 18, 2013, 9 a.m.
A family of walruses on the shore

Photo: Vladimir Melnik/Shutterstock

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Hair is used as an insulator for many mammals, but walruses, like a number of other semi-aquatic mammals, have forsaken this trait and replaced it with a cushy layer of subcutaneous fat. Walrus blubber is so thick that fur has become almost entirely unnecessary, and if it wasn't for their characteristic whiskers, their bodies would appear completely naked.