American pygmy shrew, Sorex hoyi Merriam's shrew, Sorex merriami Montane shrew, Sorex monticolus Dwarf shrew, Sorex nanus American water shrew, Sorex palustris Preble's shrew, Sorex preblei Vagrant shrew, Sorex vagrans Rodents (Order: Rodentia) Family: Castoridae (beavers) North American beaver, Castor canadensis Family: Sciuridae (squirrels) Golden-mantled ground squirrel, Callospermophilus lateralis White-tailed prairie dog, Cynomys leucurus Black-tailed prairie dog, Cynomys ludovicianus Northern flying squirrel, Glaucomys sabrinus Thirteen-lined ground squirrel, Ictidomys tridecemlineatus Hoary marmot, Marmota caligata Yellow-bellied marmot, Marmota flaviventris Yellow-pine chipmunk, Neotamias amoenus Least chipmunk, Neotamias minimus Red-tailed chipmunk, Neotamias ruficaudus Uinta chipmunk, Neotamias umbrinus Eastern gray squirrel, Sciurus carolinensis introduced Eastern fox squirrel, Sciurus niger American red squirrel, Tamiasciurus hudsonicus Uinta ground squirrel, Urocitellus armatus Columbian ground squirrel, Urocitellus columbianus Wyoming ground squirrel, Urocitellus elegans Richardson's ground squirrel, Urocitellus richardsonii Family: Heteromyidae (pocket mice and kangaroo rats) Hispid pocket mouse, Chaetodipus hispidus Ord's kangaroo rat, Dipodomys ordii Olive-backed pocket mouse, Perognathus fasciatus Great Basin pocket mouse, Perognathus parvus Family: Geomyidae (pocket gophers) Idaho pocket gopher, Thomomys idahoensis Northern pocket gopher, Thomomys talpoides Family: Dipodidae (jumping mice) Meadow jumping mouse, Zapus hudsonius Western jumping mouse, Zapus princeps Family: Cricetidae (New World mice and rats, voles, lemmings, muskrats) Sagebrush vole, Lemmiscus curtatus Long-tailed vole, Microtus longicaudus Montane vole, Microtus montanus Prairie vole, Microtus ochrogaster Meadow vole, Microtus pennsylvanicus Water vole, Microtus richardsoni Southern red-backed vole, Myodes gapperi Bushy-tailed woodrat, Neotoma cinerea Muskrat, Ondatra zibethicus Northern grasshopper mouse, Onychomys leucogaster White-footed mouse, Peromyscus leucopus Western deer mouse, Peromyscus sonoriensis Heather vole, Phenacomys intermedius Western harvest mouse, Reithrodontomys megalotis Northern bog lemming, Synaptomys borealis Family: Muridae (Old World rats and mice) House mouse, Mus musculus introduced Norway rat, Rattus norvegicus introduced Family: Echimyidae (spiny rats) Nutria, Myocastor coypus introduced Family: Erethizontidae North American porcupine, Erethizon dorsatum'' See also Lists of mammals by region Amphibians and Reptiles of Montana Birds of Montana Further reading Notes Mammals Montana