Here's the scientific classification of weasel species, starting with the broadest category and going down to the specific species:

Kingdom: Animalia (Animals)

Phylum: Chordata (Chordates)

Class: Mammalia (Mammals)

Order: Carnivora (Carnivores)

Family: Mustelidae (Weasels, badgers, otters, etc.)

Genus: *Mustela* (Weasels, stoats, ferrets, minks, etc.)

Specific Weasel Species (Examples):

* Long-tailed Weasel (Mustela frenata)

* Short-tailed Weasel (Mustela erminea)

* Least Weasel (Mustela nivalis)

* European Polecat (Mustela putorius)

Note: The genus *Mustela* includes a variety of closely related species. It's important to specify the specific species you're interested in when discussing weasels.