No otters are in the Mustelidae or Mustelids family commonly referred to as the weasel family.
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Mustelidae
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Weasels are members of the Mustelidae family and are closely
related to ferrets, mink, martens, otters, polecats and skunks who
are also members of the Mustelidae family.
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Mustela refers to the Genus in the Mustelidae Family