There are at least 50 small mammal species known to occur in Yellowstone National Park .
Pacific marten Species are listed by common name, scientific name, typical habitat and relative abundance.[1]
Order: Carnivora
Family: Procyonidae
Raccoon , Procyon lotor , rivers, cottonwoods, rare
Short-tailed weasel Order: Carnivora
Family: Mustelidae
Wolverine , Gulo gulo , alpine, coniferous forests, rareNorth American river otter , Lontra canadensis , rivers, lakes, ponds, commonPacific marten , Martes caurina , coniferous forests, commonAmerican ermine , Mustela richardsonii , willows to spruce/fir forests, commonLong-tailed weasel , Neogale frenata , willows to spruce/fir forests, commonAmerican mink , Neogale vison , riparian forests, occasionalFisher , Pekania pennanti , forests, rareAmerican badger , Taxidea taxus , sagebrush, common
Snowshoe hare Order: Lagomorpha
Family: Leporidae
Snowshoe hare , Lepus americanus , forests, willows, commonWhite-tailed jackrabbit , Lepus townsendii , sagebrush, grasslands, commonDesert cottontail , Sylvilagus audubonii , shrub lands, commonMountain cottontail , Sylvilagus nuttallii , shrub lands, common
Masked shrew Order: Soricomorpha
Family: Soricidae
Dusky shrew , Sorex monticolus , moist meadows, forests, commonMasked shrew , Sorex cinereus , moist meadows, forests, commonAmerican water shrew , Sorex palustris , moist meadows, forests, commonPreble's shrew , Sorex preblei , moist meadows, forests, rare, if presentDwarf shrew , Sorex nanus , moist meadows, forests, rare
Order: Rodentia
Family: Castoridae
Beaver , Castor canadensis , ponds, streams, approximately 500
Golden-mantled ground squirrel Order: Rodentia
Family: Sciuridae
Least chipmunk , Tamias minimus , forests, commonUinta chipmunk , Tamias umbrinus , forests, commonYellow-pine chipmunk , Tamias amoenus , forests, commonYellow-bellied marmot , Marmota flaviventris , rocky slopes, commonGolden-mantled ground squirrel , Callospermophilus lateralis , forests, rocky slopes, commonNorthern flying squirrel , Glaucomys sabrinus , forests, occasionalAmerican red squirrel , Tamiasciurus hudsonicus , forests, commonUinta ground squirrel , Urocitellus armatus , sagebrush, meadows, common
Deer mouse Order: Rodentia
Family: Cricetidae
Deer mouse , Peromyscus maniculatus , grasslands, common
Muskrat Order: Rodentia
Family: Cricetidae
Muskrat , Ondatra zibethicus , streams, lakes, ponds, commonWestern heather vole , Phenacomys intermedius , sagebrush to forests, occasionalLong-tailed vole , Microtus longicaudus , moist meadows, commonMeadow vole , Microtus pennsylvanicus , moist meadows, commonMontane vole , Microtus montanus , moist meadows, commonSouthern red-backed vole , Myodes gapperi , dense forests, commonWater vole , Microtus richardsoni , riparian, occasionalBushy-tailed woodrat , Neotoma cinerea , rocky slopes, common
Big brown bat Order: Chiroptera
Family: Vespertilionidae
Big brown bat , Eptesicus fuscus , roost in sheltered areas, commonFringe-tailed bat , Myotis thysanodes , roost in cliffs, large snags, uncommonHoary bat , Lasiurus cinereus , roost in trees. uncommonLittle brown bat , Myotis lucifugus , roost in caves, buildings, trees, commonLong-eared bat , Myotis evotis , roost in cliffs, buildings, uncommonLong-legged bat , Myotis volans , roost in tree cavities, cliffs, buildings, commonSilver-haired bat , Lasionycteris noctivagans , roost in trees, including snags, commonWestern small-footed bat , Myotis ciliolabrum , roost in rocky areas, caves, rare, if presentTownsend's big-eared bat , Corynorhinus townsendii , roost in caves, uncommonYuma bat , Myotis yumanensis , roost in caves, buildings, trees. rare, if present
Broderick, Harold J. (1954). Wild Animals of Yellowstone National Park . Yellowstone Library and Museum Association, Yellowstone National Park, National Park Service. Streubel, Donald P. (1995). Small Mammals of the Yellowstone Ecosystem . Boulder, CO: Robert Rineharts. ISBN 0-911797-59-9 
