Kingdom Animalia
.Phylum Chordata
..Subphylum Vertebrata—vertebrates
...Class Mammalia—Mammals
......Subclass Theria—placentals and marsupials
.......Infraclass Eutheria—placental mammals etc.
.........Order Rodentia—rodents
..........Suborder Hystricognatha—chinchilla rats, cavies, nutria, porcupines,
...........Infraorder Hystricognathi—chinchilla rats, cavies, nutria, porcupines
............Family Erethizontidae—New World porcupines
..............Genus Erethizon—New World porcupines
...............Species dorsatum—North American Porcupine—Track
..........Suborder Myomorpha—mice, rats, souris
............Family Dipodidae—birch mice, jeroboas, jumping mice
.............Subfamily Zapodinae—jumping mice
..............Genus Zapus—jumping mice
...............Species hudsonius—Meadow Jumping Mouse
............Family Geomyidae—pocket gophers
..............Genus Geomys—Eastern pocket gophers
...............Species bursarius—Plains Pocket Gopher
..............Genus Thomomys—Western pocket gophers
...............Species talpoides—Northern Pocket Gopher
............Family Heteromyidae—heteromyid rodents, kangaroo mice, kangaroo rats, pocket mice
.............Subfamily Perognathinae—pocket mice
..............Genus Perognathus—pocket mice
...............Species fasciatus—Olive-Backed Pocket Mouse
...............Species flavus—Silky Pocket Mouse
..............Genus Chaetodipus
...............Species hispidus—Hispid Pocket Mouse
.............Subfamily Dipodomyinae—kangaroo rats
..............Genus Dipodomys—kangaroo rats
...............Species ordii—Ord's Kangaroo Rat
............Family Muridae—campagnols, mice, rats, souris, voles, muskrats
.............Subfamily Arvicolinae—arvicoline rodents: voles, muskrats
..............Genus Lemmiscus—sagebrush voles
...............Species curtatus—Sagebrush Vole
..............Genus Microtus—voles
...............Species chrotorrhinus—Yellow-Nosed Vole, Rock Vole
...............Species longicaudus—Long-Tailed Vole
...............Species montanus—Mountain Vole
...............Species ochrogaster—Prairie Vole
...............Species pennsylvanicus—Meadow Vole
..............Genus Clethrionomys—red-backed voles
...............Species gapperi—Boreal Red-Backed Vole
..............Genus Ondatra—muskrats
...............Species zibethicus—Muskrat
.............Subfamily Sigmodontinae—New World rats and mice
..............Genus Reithrodontomys—harvest mice
...............Species montanus—Plains Harvest Mouse
...............Species megalotis—Western Harvest Mouse
..............Genus Peromyscus
...............Species maniculatus—Deer Mouse
...............Species leucopus—White-Footed Mouse
..............Genus Onychomys
...............Species leucogaster—Northern Grasshopper Mouse
..............Genus Neotoma
...............Species cinerea—Bushy-Tailed Woodrat
.............Subfamily Murinae—Old World rats and mice
..............Genus Rattus
...............Species norvegicus—Norway Rat
..............Genus Mus
...............Species musculus—House Mouse
..........Suborder Sciuromorpha—squirrels
............Family Aplodontiidae—mountain beavers
............Family Castoridae—beavers
..............Genus Castor—beavers
...............Species canadensis—American Beaver—Track
............Family Sciuridae—chipmunks, marmots, squirrels
............Subfamily Pteromyinae—flying squirrels
..............Genus Glaucomys—flying squirrels
...............Species sabrinus—Northern Flying Squirrel
............Subfamily Sciurinae—(chipmunks, ground squirrels, marmots, and tree squirrels)
..............Genus Ammospermophilus—antelope-squirrels
...............Species leucurus—White-Tailed Antelope Squirrel
..............Genus Cynomys—prairie dogs
...............Species leucurus—White-Tailed Prairie Dog
...............Species ludovicianus—Black-Tailed Prairie Dog
..............Genus Marmota—marmots
...............Species flaviventris—Yellow-Bellied Marmot
..............Genus Sciurus—tree squirrels
...............Species niger—Fox Squirrel
..............Genus Spermophilus—ground squirrels and rock squirrels (cf. Genus Citellus)
...............Species tridecemlineatus—Thirteen-Lined Ground Squirrel
...............Species brunneus—Idaho Ground Squirrel
...............Species elegans—Wyoming Ground Squirrel
...............Species franklinii—Franklin's Ground Squirrel
...............Species lateralis—Golden-Mantled Ground Squirrel
...............Species richardsonii—Richardson's Ground Squirrel
...............Species spilosoma—Spotted Ground Squirrel
...............Species townsendii—Townsend's Ground Squirrel
...............Species variegatus—Rock Squirrel
..............Genus Tamias—chipmunks
...............Species minimus—Least Chipmunk
..............Genus Tamiasciurus—American red squirrels and chickarees
...............Species hudsonicus—Red Squirrel—Track