This page attempts to provide a standardized side-by-side comparison of all species in the US that are in the Squirrel family (Sciuridae) — tree squirrels, ground squirrels, marmots, prairie dogs, flying squirrels, and chipmunks. Standardized images for some species are not available, yet. For species not represented with an image here, images from the field are typically available on the individual species pages. Adults in summer pelage are shown unless otherwise noted.

Chipmunks

Neotamias (chipmunks)

See also Tamias for one species of chipmunk that is in a separate genus.

Alpine Chipmunk (Neotamias alpinus) observed by Ed Miller in Tuolumne County, California.
Yellow-pine Chipmunk (Neotamias amoenus) observed by Andrew Simon in Bulkley-Nechako, British Columbia, Canada.
Gray-footed Chipmunk (Neotamias canipes) photographed by CK2AZ in Lincoln National Forest, Cloudcroft, New Mexico.
Gray-collared Chipmunk (Neotamias cinereicollis) photographed by Michael Stremciuc in Coconino National Forest, Arizona.
Crater Chipmunk (Neotamias cratericus)
Cliff Chipmunk (Neotamias dorsalis) photographed by Rick Overson in the Superstition Mountains of Arizona. Coloration of upper parts is tones of smoke or neutral gray. The shoulders and rump are gray.
Coulee Chipmunk (Neotamias grisescens) photographed by Alex Sowers in Lincoln County, Washington.
Merriam's Chipmunk (Neotamias merriami) photographed by Tom Mills in Palmdale, California. The tail is long and bushy (75-97% of length of head and body). The cheeks and underparts are white and more or less dulled by gray, but in coastal areas the cheeks and underparts usually are suffused with ochraceous.
Least Chipmunk (Neotamias minimus) photographed by whitemudwayne at the University Of Alberta Farm in Edmonton, Alberta, Canada. Summer pelage is brighter than the grayish winter pelage.
California Chipmunk (Neotamias obscurus) photographed by cybilla in Hidden Valley, California.
Yellow-cheeked Chipmunk (Neotamias ochrogenys) photographed by Sam Koski Jones in Mendocino County, California.
Palmer's Chipmunk (Neotamias palmeri) photographed by Lonny Holmes in mid-August in Clark County, Nevada.
Panamint Chipmunk (Neotamias panamintinus) photographed by markc666 in Inyo County, California. Characterized in summer pelage by bright tawny colors and a conspicuous gray rump, and in winter pelage by duller colors and even more gray on the rump. The cheeks and facial stripes are pale gray, nearly white.
Long-eared Chipmunk (Neotamias quadrimaculatus) photographed by Michael Hawk in Tuolumne County, California. A reddish species with noticeably large ears and large white postauricular patches. The rump and thighs are more buffy (less grayish) in summer.
Colorado Chipmunk (Neotamias quadrivittatus) observed by Ad Konings in Saguache County, Colorado.
Red-tailed Chipmunk (Neotamias ruficaudus)
Hopi Chipmunk (Neotamias rufus) observed by feinerr in Grand County, Utah.
Shadow Chipmunk (Neotamias senex) photographed by My World of Bird Photography in Humboldt County, California.
Siskiyou Chipmunk (Neotamias siskiyou)
Sonoma Chipmunk (Neotamias sonomae) photographed by gosner at Carson Falls, Bolinas, California.
Lodgepole Chipmunk (Neotamias speciosus)
Townsend's Chipmunk (Neotamias townsendii) photographed by Liam Hutcheson in Neah Bay, Washington.
Uinta Chipmunk (Neotamias umbrinus)
Eastern Chipmunk (Tamias striatus)

Tamias (chipmunks)

Eastern Chipmunk (Tamias striatus)

Ground squirrels

Ammospermophilus (antelope ground squirrels)

Harris's Antelope Squirrel (Ammospermophilus harrisii) photographed by Craig Robson in Pima County, Arizona.
Texas Antelope Squirrel (Ammospermophilus interpres) photographed by Chris Harrison in Franklin Mountains State Park, Texas.
White-tailed Antelope Squirrel (Ammospermophilus leucurus) photographed by lonnyholmes in Clark County, Nevada.
Nelson's Antelope Squirrel (Ammospermophilus nelsoni) photographed in California by Paul Donahue.

Callospermophilus (golden-mantled ground squirrels)

Common Golden-mantled Ground Squirrel (Callospermophilus lateralis) photographed by Rick Overson on Mount Howard, Oregon.
Cascade Golden-mantled Ground Squirrel (Callospermophilus saturatus) photographed by Pierce Louderback in Pierce County, Washington.

Cynomys (burrowing ground squirrels or prairie dogs)

Gunnison's Prairie Dog (Cynomys gunnisoni) observed by Cathy Pasterczyk in Taos, New Mexico.
White-tailed Prairie Dog (Cynomys leucurus) observed by Liam Pentangelo in Jackson County, Colorado.
Black-tailed Prairie Dog (Cynomys ludovicianus) observed by Liam Pentangelo in Boulder County, Colorado.
Utah Prairie Dog (Cynomys parvidens) observed by Creed Clayton in southern Utah.

Ictidomys (ground squirrels)

Rio Grande Ground Squirrel (Ictidomys parvidens) photographed by Alex Lamoreaux in Starr County, Texas.
Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus) photographed by Zoë Unruh in Saskatchewan, Canada.

Marmota (marmots or woodchucks or groundhogs)

Alaska Marmot (Marmota broweri) photographed by Robert Weeden near Toolik Field Station, Brooks Range, Alaska.
Hoary Marmot (Marmota caligata) photographed by Eemeli Haverinen in Denali National Park, Alaska.
Yellow-bellied Marmot (Marmota flaviventris) photographed by Rick Overson in Custer Gallatin National Forest, Montana.
Woodchuck (Marmota monax) photographed by sfreeman7 in Toronto, Ontario, Canada.
Olympic Marmot (Marmota olympus) photographed by Mike Merchant in Clallam County, Washington.

Otospermophilus (ground squirrels)

California Ground Squirrel (Otospermophilus beecheyi) photographed by Nathan Petersen near Pasadena, California. © Nathan Petersen
Douglas's Ground Squirrel (Otospermophilus douglasii) observed by Jonathan Eisen.
Common Rock Squirrel (Otospermophilus variegatus) observed by Tim Healy at the Grand Canyon in Arizona.

Poliocitellus (ground squirrels)

Franklin's Ground Squirrel (Poliocitellus franklinii) observed dexternienhaus in Carlton County, Minnesota.

Urocitellus (ground squirrels)

Species not pictured: Idaho Ground Squirrel (Urocitellus brunneus), Snake River Plains Ground Squirrel (Urocitellus idahoensis), Piute Ground Squirrel (Urocitellus mollis).

Uinta Ground Squirrel (Urocitellus armatus) photographed by pirish761 in Yellowstone National Park, Wyoming.
Belding's Ground Squirrel (Urocitellus beldingi) photographed by Roger Woodruff in Tuolumne County, California. The mid-dorsal area often is darker reddish-brown than the sides, although the conspicuousness of this trait varies geographically.
Merriam's Ground Squirrel (Urocitellus canus) photographed by Christopher Lindsey in Baker County, Oregon.
Columbian Ground Squirrel (Urocitellus columbianus) photographed by Andrey Atuchin in Kananaskis, Alberta, Canada.
Wyoming Ground Squirrel (Urocitellus elegans) photographed by wyattherp in Grand County, Colorado.
Arctic Ground Squirrel (Urocitellus parryii) photographed by Steve Hillebrand/USFWS.
Richardson's Ground Squirrel (Urocitellus richardsonii) photographed by Pia Odgaard in Alberta, Canada.
Townsend's Ground Squirrel (Urocitellus townsendii) photographed by Dasha Gudalewicz in Washington state.
Washington Ground Squirrel (Urocitellus washingtoni) photographed by TonyP PNW in Washington state.

Xerospermophilus (ground squirrels)

Mohave Ground Squirrel (Xerospermophilus mohavensis) photographed by kliewer in Kern County, California.
Spotted Ground Squirrel (Xerospermophilus spilosoma) photographed by mnwild in southeastern Arizona.
Round-tailed Ground Squirrel (Xerospermophilus tereticaudus) photographed by Eric CLeveland in Twentynine Palms, California.

Flying squirrels

Glaucomys

Species not pictured: Humboldt's Flying Squirrel (Glaucomys oregonensis)

Northern Flying Squirrel (Glaucomys sabrinus)
Southern Flying Squirrel (Glaucomys volans)

Tree squirrels

Sciurus (tree squirrels)

Abert's Squirrel (Sciurus aberti) observed by Marleigh Fletcher in Pima County, Arizona.
Arizona Gray Squirrel (Sciurus arizonensis) observed by Paul Donahue in Madera Canyon, Arizona.
Eastern Gray Squirrel (Sciurus carolinensis) observed by Ben Zerante in Chicago, Illinois.
Western Gray Squirrel (Sciurus griseus) observed by nutsaboutkitties in San Gabriel Mountains National Monument, California.
Mexican Fox Squirrel (Sciurus nayaritensis)
Eastern Fox Squirrel (Sciurus niger)

Tamiasciurus (pine squirrels)

Douglas's Squirrel (Tamiasciurus douglasii) photographed by VJ Anderson in Washington state.
Fremont's Squirrel (Tamiasciurus fremonti) photographed by Rachel Stringham in Apache County, Arizona.
Fremont's Squirrel (Tamiasciurus fremonti) photographed by Brad Shine in Lincoln National Forest, Cloudcroft, New Mexico.
North American Red Squirrel (Tamiasciurus hudsonicus) observed by danabra in Montréal, Québec, Canada.