American mink
The American mink differs from members of the genus "Mustela" (stoats and weasels), as well as the other members of "Neogale", by its larger size and stouter form, which closely approach those of martens. It shares with martens a uniformly enlarged, bushy and somewhat tapering tail, rather than a slender, cylindrical tail with an enlarged bushy tip, as is the case in stoats. The American mink is similar in build to the European mink, but the tail is longer (constituting 38–51% of its body length).