Class Mammalia Linnaeus, 1758 - mammals
Order Carnivora Bowdich, 1821 - carnivores
Family Mustelidae Batsch, 1788 - weasels, badgers, skunks, and otters
Subfamily Mustelinae Batsch, 1788 - weasels
Genus Mustela Linnaeus, 1758 - weasels, ermines, stoats, minks, ferrets, and polecats
Mustela nivalis Linnaeus, 1766 - least weasel