
<p>The <b>sea otter</b> (<i>Enhydra lutris</i>) is a <a href="/wiki/Marine_mammal" title="Marine mammal">marine mammal</a> native to the coasts of the northern and eastern <a href="/wiki/Pacific_Ocean" title="Pacific Ocean">North Pacific Ocean</a>. Adult sea <a href="/wiki/Otter" title="Otter">otters</a> typically weigh between 14 and 45&#160;kg (31 and 99&#160;lb), making them the heaviest members of the <a href="/wiki/Mustelidae" title="Mustelidae">weasel family</a>, but among the smallest marine mammals. Unlike most marine mammals, the sea otter's primary form of insulation is an exceptionally thick coat of <a href="/wiki/Fur" title="Fur">fur</a>, the densest in the animal kingdom. Although it can walk on land, the sea otter lives mostly in the ocean.</p>