least weasel

noun1

1. •
   The common weasel, little weasel, or simply weasel (Mustela nivalis), the smallest member of the weasel genus Mustela, native to Eurasia, North America, and North Africa.

   • The range of the Least Weasel extends entirely across the continent on this hemisphere; but its north and south dispersion are less definite, in the present state of our knowledge. — 1877