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, rare
Badgers and weasels
Order: Carnivora Family: Mustelidae
American badger, Taxidea taxus, sagebrush, common
Fisher, Martes pennanti, forests, rare, if present
American marten, Martes americana, coniferous forests, common
American mink, Neovison vison, riparian forests, occasional
North American river otter, Lontra canadensis, rivers, lakes, ponds, common
Long-tailed weasel, Mustela frenata, willows to spruce/fir forests, common
Short-tailed weasel, Mustela erminea, willows to spruce/fir forests, common
Wolverine, Gulo gulo, alpine, coniferous forests, rare
Order: Carnivora Family: Mephitidae
Striped skunk, Mephitis mephitis, riparian to forest, rare
Hares and rabbits
Order: Lagomorpha Family: Leporidae
Snowshoe hare, Lepus americanus, forests, willows, common
White-tailed jackrabbit, Lepus townsendii, sagebrush, grasslands, common
Desert cottontail, Sylvilagus audubonii, shrub lands, common
Mountain cottontail, Sylvilagus nuttallii, shrub lands, common
Order: Lagomorpha Family: Ochotonidae
American pika, Ochotona princeps, rocky slopes, common
Order: Soricomorpha Family: Soricidae
Dusky shrew, Sorex monticolus, moist meadows, forests, common
Masked shrew, Sorex cinereus, moist meadows, forests, common
American water shrew, Sorex palustris, moist meadows, forests, common
Preble's shrew, Sorex preblei, moist meadows, forests, rare, if present
Dwarf shrew, Sorex nanus, moist meadows, forests, rare
Order: Rodentia Family: Castoridae
Beaver, Castor canadensis, ponds, streams, approximately 500
Order: Rodentia Family: Sciuridae
Least chipmunk, Tamias minimus, forests, common
Uinta chipmunk, Tamias umbrinus, forests, common
Yellow-pine chipmunk, Tamias amoenus, forests, common
Yellow-bellied marmot, Marmota flaviventris, rocky slopes, common
Golden-mantled ground squirrel, Callospermophilus lateralis, forests, rocky slopes, common
Northern flying squirrel, Glaucomys sabrinus, forests, occasional
American red squirrel, Tamiasciurus hudsonicus, forests, common
Uinta ground squirrel, Urocitellus armatus, sagebrush, meadows, common
Order: Rodentia Family: Geomyidae
Northern pocket gopher, Thomomys talpoides, sagebrush, meadows, forests, common
Order: Rodentia Family: Cricetidae
Deer mouse, Peromyscus maniculatus, grasslands, common
Order: Rodentia Family: Dipodidae
Western jumping mouse, Zapus princeps, riparian, occasional
Muskrats, voles and woodrats
Order: Rodentia Family: Cricetidae
Muskrat, Ondatra zibethicus, streams, lakes, ponds, common
Western heather vole, Phenacomys intermedius, sagebrush to forests, occasional
Long-tailed vole, Microtus longicaudus, moist meadows, common
Meadow vole, Microtus pennsylvanicus, moist meadows, common
Montane vole, Microtus montanus, moist meadows, common
Southern red-backed vole, Myodes gapperi, dense forests, common
Water vole, Microtus richardsoni, riparian, occasional
Bushy-tailed woodrat, Neotoma cinerea, rocky slopes, common
Order: Rodentia Family: Erethizontidae
North American porcupine, Erethizon dorsatum, forests, sagebrush, willows, common
Order: Chiroptera Family: Vespertilionidae
Big brown bat, Eptesicus fuscus, roost in sheltered areas, common
Fringe-tailed bat, Myotis thysanodes, roost in cliffs, large snags, uncommon
Hoary bat, Lasiurus cinereus, roost in trees. uncommon
Little brown bat, Myotis lucifugus, roost in caves, buildings, trees, common
Long-eared bat, Myotis evotis, roost in cliffs, buildings, uncommon
Long-legged bat, Myotis volans, roost in tree cavities, cliffs, buildings, common
Silver-haired bat, Lasionycteris noctivagans, roost in trees, including snags, common
Western small-footed bat, Myotis ciliolabrum, roost in rocky areas, caves, rare, if present
Townsend's big-eared bat, Corynorhinus townsendii, roost in caves, uncommon
Yuma bat, Myotis yumanensis, roost in caves, buildings, trees. rare, if present
