Dimensions vary geographically, to an extent rarely found among other mammals. Least weasels of the "boccamela" group, for example, may outweigh the smaller races by almost four times. In some large subspecies, the male may be 1.5 times longer than the female. Variations in tail length are also variable, constituting from 13 to 30% of the length of the body. Average body length in males is , while females average . The tail measures in males and in females. Males weigh , while females weigh .