There are at least 50 small mammal species known to occur in Yellowstone National Park.
Species are listed by common name, scientific name, typical habitat and relative abundance.
Order: Carnivora Family: Procyonidae
Raccoon, Procyon lotor, rivers, cottonwoods, rareBadgers and weasels
Order: Carnivora Family: Mustelidae
American badger, Taxidea taxus, sagebrush, commonFisher, Martes pennanti, forests, rare, if presentAmerican marten, Martes americana, coniferous forests, commonAmerican mink, Neovison vison, riparian forests, occasionalNorth American river otter, Lontra canadensis, rivers, lakes, ponds, commonLong-tailed weasel, Mustela frenata, willows to spruce/fir forests, commonShort-tailed weasel, Mustela erminea, willows to spruce/fir forests, commonWolverine, Gulo gulo, alpine, coniferous forests, rareOrder: Carnivora Family: Mephitidae
Striped skunk, Mephitis mephitis, riparian to forest, rareHares and rabbits
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, commonOrder: Lagomorpha Family: Ochotonidae
American pika, Ochotona princeps, rocky slopes, commonOrder: 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, rareOrder: Rodentia Family: Castoridae
Beaver, Castor canadensis, ponds, streams, approximately 500Order: 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, commonOrder: Rodentia Family: Geomyidae
Northern pocket gopher, Thomomys talpoides, sagebrush, meadows, forests, commonOrder: Rodentia Family: Cricetidae
Deer mouse, Peromyscus maniculatus, grasslands, commonOrder: Rodentia Family: Dipodidae
Western jumping mouse, Zapus princeps, riparian, occasionalMuskrats, voles and woodrats
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, commonOrder: Rodentia Family: Erethizontidae
North American porcupine, Erethizon dorsatum, forests, sagebrush, willows, commonOrder: 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
