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All fur no blubber | by USFWS Pacific Southwest Region
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All fur no blubber

Sea otters have the densest fur in the animal kingdom, ranging from 250,000 to a million hairs per square inch, which insulates them and maintains warmth. Unlike other marine mammals, the sea otter does not have a layer of blubber (fat) to help keep it warm. Photo by USFWS.

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Taken on January 27, 2010