The sea mink (Neovison macrodon) is an extinct North American member of the family Mustelidae. It is the only mustelid, and one of only two terrestrial mammal species in the order Carnivora, to become extinct in historic times (the other being the Falkland Islands wolf). The body of the sea mink was significantly longer than that of the closely related American mink (N. vison), and also bulkier, leading to a pelt that was almost twice the size of the other species.