page_title: List of mammals of the United States
section_title: Order: Rodentia (rodents)
hierarchical_section_title: List of mammals of the United States / Subclass: Theria / Infraclass: Eutheria / Order: Rodentia (rodents)
caption_attribution_description: Round-tailed Ground Squirrel (Spermophilus tereticaudus). Photo taken in Tucson, Arizona.
context_page_description: About 490 species of mammals are recorded in the United States. This list is probably incomplete. Unincorporated territories like for example Puerto Rico, Guam or Northern Mariana Islands are not covered. Mammals introduced and extinct in the Holocene except Pleistocene/Holocene boundary are included.
  According to the IUCN Red List 3 of these species are critically endangered, 20 endangered, 15 vulnerable, 20 near threatened and 4 extinct.
  Some species are identified as indicated below:
  - Accidental
  - Extinct
  - Extirpated
  (I) - Introduced
  The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature:
  and the Endangered Species Act:
context_section_description: Rodents make up the largest order of mammals, with over 40% of mammalian species. They have two incisors in the upper and lower jaw which grow continually and must be kept short by gnawing. Most rodents are small though the capybara can weigh up to 45 kg (99 lb).
  Suborder: Hystricognathi
  Family: Erethizontidae (New World porcupines)
  Subfamily: Erethizontinae
  North American porcupine, Erethizon dorsatum  LC
  Suborder: Sciurognathi
  Family: Aplodontiidae (mountain beaver)
  Mountain beaver, Aplodontia rufa  LC (ssp. nigra: E)
  Family: Castoridae (beavers)
  American beaver, Castor canadensis  LC
  Family: Sciuridae (squirrels)
  Subfamily: Sciurinae
  Tribe: Sciurini
  Abert's squirrel, Sciurus aberti  LC
  Arizona gray squirrel, Sciurus arizonensis  DD
  Eastern gray squirrel, Sciurus carolinensis  LC
  Western gray squirrel, Sciurus griseus  LC
  Mexican fox squirrel, Sciurus nayaritensis  LC
  Fox squirrel, Sciurus niger  LC
  (Delmarva fox squirrel, S. n. cinereus: E)
  Douglas squirrel, Tamiasciurus douglasii  LC
  American red squirrel, Tamiasciurus hudsonicus  LC
  (Mount Graham red squirrel, T. h. grahamensis: E)
  Tribe: Pteromyini
  Northern flying squirrel, Glaucomys sabrinus  LC
  (Carolina northern flying squirrel G. s. coloratus and Virginia northern flying squirrel G. s. fuscus: E)
  Humboldt's flying squirrel, Glaucomys oregonensis
  Southern flying squirrel, Glaucomys volans  LC
  Subfamily: Xerinae
  Tribe: Marmotini
  Harris's antelope squirrel, Ammospermophilus harrisii  LC
  Texas antelope squirrel, Ammospermophilus interpres  LC
  White-tailed antelope squirrel, Ammospermophilus leucurus  LC
  San Joaquin antelope squirrel, Ammospermophilus nelsoni  EN
  Gunnison's prairie dog, Cynomys gunnisoni  LC
  White-tailed prairie dog, Cynomys leucurus  LC
  Black-tailed prairie dog, Cynomys ludovicianus  LC
  Utah prairie dog, Cynomys parvidens  EN T
  Alaska marmot, Marmota broweri  (Alaska only) LC
  Hoary marmot, Marmota caligata  LC
  Yellow-bellied marmot, Marmota flaviventris  LC
  Groundhog, Marmota monax  LC
  Olympic marmot, Marmota olympus  LC
  California ground squirrel, Otospermophilus beecheyi  LC
  Rock squirrel, Otospermophilus variegatus  LC
  Golden-mantled ground squirrel, Callospermophilus lateralis  LC
  Cascade golden-mantled ground squirrel, Callospermophilus saturatus  LC
  Mohave ground squirrel, Xerospermophilus mohavensis  VU
  Spotted ground squirrel, Xerospermophilus spilosoma  LC
  Round-tailed ground squirrel, Xerospermophilus tereticaudus  LC
  Franklin's ground squirrel, Poliocitellus franklinii  LC
  Mexican ground squirrel, Ictidomys mexicanus  LC
  Thirteen-lined ground squirrel, Ictidomys tridecemlineatus  LC
  Uinta ground squirrel, Urocitellus armatus  LC
  Belding's ground squirrel, Urocitellus beldingi  LC
  Northern Idaho ground squirrel, Urocitellus brunneus  CR
  Southern Idaho ground squirrel, Urocitellus endemicus  VU
  Columbian ground squirrel, Urocitellus columbianus  LC
  Wyoming ground squirrel, Urocitellus elegans  LC
  Arctic ground squirrel, Urocitellus parryii  (Alaska only) LC
  Richardson's ground squirrel, Urocitellus richardsonii  LC
  Townsend's ground squirrel, Urocitellus townsendii  VU and:
  Merriam's ground squirrel, Urocitellus canus  LC
  Piute ground squirrel, Urocitellus mollis  LC
  Townsend's ground squirrel, Urocitellus (townsendii) nancyae  VU
  Washington ground squirrel, Urocitellus washingtoni  NT
  Alpine chipmunk, Tamias alpinus  LC
  Yellow-pine chipmunk, Tamias amoenus  LC
  Gray-footed chipmunk, Tamias canipes  LC
  Gray-collared chipmunk, Tamias cinereicollis  LC
  Cliff chipmunk, Tamias dorsalis  LC
  Merriam's chipmunk, Tamias merriami  LC
  Least chipmunk, Tamias minimus  LC
  California chipmunk, Tamias obscurus  LC
  Yellow-cheeked chipmunk, Tamias ochrogenys  LC
  Palmer's chipmunk, Tamias palmeri  EN
  Panamint chipmunk, Tamias panamintinus  LC
  Long-eared chipmunk, Tamias quadrimaculatus  LC
  Colorado chipmunk, Tamias quadrivittatus  LC
  Red-tailed chipmunk, Tamias ruficaudus  LC
  Hopi chipmunk, Tamias rufus  LC
  Allen's chipmunk, Tamias senex  LC
  Siskiyou chipmunk, Tamias siskiyou  LC
  Sonoma chipmunk, Tamias sonomae  LC
  Lodgepole chipmunk, Tamias speciosus  LC
  Ea
caption: Round-tailed ground squirrel
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