Mustelids Striped skunk, _Mephitis mephitis_ E, W, open forests, grasslands Badger, _Taxidea taxus_ E, W, grasslands River otter, _Lutra canadensis_ E, W, R, rivers, lakes Wolverine, _Gulo gulo_ E, W, A, coniferous forests, alpine meadows Least weasel, _Mustela rixosa_ E, R, open forests, grasslands Shorttail weasel, _Mustela erminea_ E, W, A, coniferous forests, meadows Longtail weasel, _Mustela frenata_ E, W, A, open forests, meadows Mink, _Mustela vison_ E, W, creek and lake edges Marten, _Martes americana_ E, W, A, coniferous forests Fisher, _Martes pennanti_ E, W, R, coniferous forests Lagomorphs Pika, _Ochotona princeps_ E, W, A, rockslides Snowshoe hare, _Lepus americanus_ E, W, coniferous forests Whitetail jackrabbit, _Lepus townsendii_ E, W, R, grasslands Squirrels Hoary marmot, _Marmota caligata_ E, W, A, rocky areas, alpine meadows Richardson ground squirrel, _Spermophilus richardsonii_ E, R, grasslands Columbian ground squirrel, _Citellus columbianus_ E, W, A, open woodlands, grasslands, alpine meadows Thirteen-lined ground squirrel, _Spermophilus tridecemlineatus_ E, R, grasslands Golden-mantled squirrel, _Spermophilus lateralis_ E, W, A, high, open forests; rocky areas Least chipmunk, _Eutamias minimus_ E, W, A, high, open forests; brushy, rocky areas; alpine meadows Yellow pine chipmunk, _Eutamias amoenus_ E, W, open forests; brushy, rocky areas Redtail chipmunk, _Eutamias ruficaudus_ E, W, open forests; brushy, rocky areas Red squirrel, _Tamiasciurus hudsonicus_ E, W, coniferous forests Northern flying squirrel, _Glaucomys sabrinus_ E, W, coniferous forests; nocturnal Pocket gophers Northern pocket gopher, _Thomomys talpoides_ E, W, A, meadows [Illustration: Beaver] Beaver Beaver, _Castor canadensis_ E, W, streams, lakes Voles and kin Deer mouse, _Peromyscus maniculatus_ E, W, A, forests, grasslands, alpine meadows Bushytail woodrat, _Neotoma cinerea_ E, W, A, rocky areas, old buildings Northern bog lemming, _Synaptomys borealis_ W, R, coniferous forests Mountain phenacomys, _Phenacomys intermedius_ E, W, A, coniferous forests, alpine meadows Boreal redback vole, _Clethrionomys gapperi_ E, W, coniferous forests Meadow vole, _Microtus pennsylvanicus_ E, W, open forests, meadows; along streams; marshy areas Longtail vole, _Microtus longicaudus_ E, W, coniferous forests, grasslands Water vole, _Arvicola richardsoni_ E, W, A, high-elevation stream and lake edges Muskrat, _Ondatra zibethica_ W, streams, lakes, marshy areas Western jumping mouse, _Zapus princeps_ E, W, A, grasslands, alpine meadows