The term 'Brown Weasels' is a collective name for two species of small mammals, the stoat (Mustela erminea) and the least weasel (Mustela nivalis). Both species are members of the Mustelidae family and are found in Europe, Asia, and North America. The stoat is larger than the least weasel and has a brown coat with white underparts. The least weasel is much smaller and has a brown coat with white patches on its face and chest. Both species are carnivorous and feed on small rodents, birds, and insects.