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The largest member of the weasel family, the sea otter is also the 2nd smallest marine mammal. Sea otters have the thickest 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.

Species of Otter

Sea Otter | River Otter | Marine Otter | European Otter | Giant Otter