A Sea otter (Enhydra lutris) is the only otter that can spend its entire life at sea. As with all otters, it is a mustelid.

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Carnivorans (Carnivora)
Otters (Lutrinae) Sea otter | Marine otter
Walruses (Odobeniidae) Walrus
Eared seals (Otariidae) Antarctic fur seal | Guadalupe fur seal | Juan Fernandez fur seal | Galapagos fur seal | South African fur seal | Australian fur seal | New Zealand fur seal | Subantarctic fur seal | South American fur seal