| Oregon | 17 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Belding's Ground Squirrel (Urocitellus beldingi)
- California Ground Squirrel (Spermophilus beecheyi)
- Columbian Ground Squirrel (Urocitellus columbianus)
- Douglas' Squirrel (Tamiasciurus douglasii)
- Douglas's Ground Squirrel (Otospermophilus douglasii)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Humboldt's Flying Squirrel (Glaucomys oregonensis)
- Merriam's Ground Squirrel (Urocitellus canus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Piute Ground Squirrel (Urocitellus mollis)
- Washington Ground Squirrel (Urocitellus washingtoni)
- Western Gray Squirrel (Sciurus griseus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
- Wyoming Ground Squirrel (Urocitellus elegans)
|
| California | 15 |
- Belding's Ground Squirrel (Urocitellus beldingi)
- California Ground Squirrel (Otospermophilus beecheyi)
- Douglas's Ground Squirrel (Otospermophilus douglasii)
- Douglas's Squirrel (Tamiasciurus douglasii)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Humboldt's Flying Squirrel (Glaucomys oregonensis)
- Mohave Ground Squirrel (Xerospermophilus mohavensis)
- Nelson's Antelope Squirrel (Ammospermophilus nelsoni)
- Piute Ground Squirrel (Urocitellus mollis)
- Rock Squirrel (Otospermophilus variegatus)
- Round-tailed Ground Squirrel (Xerospermophilus tereticaudus)
- Western Gray Squirrel (Sciurus griseus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
|
| Idaho | 15 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Belding's Ground Squirrel (Urocitellus beldingi)
- Columbian Ground Squirrel (Urocitellus columbianus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Merriam's Ground Squirrel (Urocitellus canus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Northern Idaho Ground Squirrel (Urocitellus brunneus)
- Piute Ground Squirrel (Urocitellus mollis)
- Rock Squirrel (Otospermophilus variegatus)
- Southern Idaho Ground Squirrel (Urocitellus endemicus)
- Uinta Ground Squirrel (Urocitellus armatus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
- Wyoming Ground Squirrel (Urocitellus elegans)
|
| Washington | 14 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- California Ground Squirrel (Spermophilus beecheyi)
- Cascade Golden-mantled Ground Squirrel (Callospermophilus saturatus)
- Columbian Ground Squirrel (Urocitellus columbianus)
- Douglas' Squirrel (Tamiasciurus douglasii)
- Douglas's Ground Squirrel (Otospermophilus douglasii)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Humboldt's Flying Squirrel (Glaucomys oregonensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Townsend's Ground Squirrel (Urocitellus townsendii)
- Washington Ground Squirrel (Urocitellus washingtoni)
- Western Gray Squirrel (Sciurus griseus)
|
| Nevada | 13 |
- Belding's Ground Squirrel (Urocitellus beldingi)
- California Ground Squirrel (Otospermophilus beecheyi)
- Douglas' Squirrel (Tamiasciurus douglasii)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Humboldt's Flying Squirrel (Glaucomys oregonensis)
- Least Chipmunk (Tamias minimus)
- Merriam's Ground Squirrel (Urocitellus canus)
- Piute Ground Squirrel (Urocitellus mollis)
- Rock Squirrel (Otospermophilus variegatus)
- Round-tailed Ground Squirrel (Xerospermophilus tereticaudus)
- Western Gray Squirrel (Sciurus griseus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
- Wyoming Ground Squirrel (Urocitellus elegans)
|
| Utah | 13 |
- Abert's Squirrel (Sciurus aberti)
- American Red Squirrel (Tamiasciurus hudsonicus)
- Belding's Ground Squirrel (Urocitellus beldingi)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Least Chipmunk (Tamias minimus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Piute Ground Squirrel (Urocitellus mollis)
- Rock Squirrel (Otospermophilus variegatus)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
- Uinta Ground Squirrel (Urocitellus armatus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
- Wyoming Ground Squirrel (Urocitellus elegans)
|
| Arizona | 12 |
- Abert's Squirrel (Sciurus aberti)
- American Red Squirrel (Tamiasciurus hudsonicus)
- Arizona Gray Squirrel (Sciurus arizonensis)
- Fremont's Squirrel (Tamiasciurus fremonti)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Harris's Antelope Squirrel (Ammospermophilus harrisii)
- Mexican Fox Squirrel (Sciurus nayaritensis)
- Rock Squirrel (Otospermophilus variegatus)
- Round-tailed Ground Squirrel (Xerospermophilus tereticaudus)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
|
| New Mexico | 12 |
- Abert's Squirrel (Sciurus aberti)
- Arizona Gray Squirrel (Sciurus arizonensis)
- Eastern Fox Squirrel (Sciurus niger)
- Fremont's Squirrel (Tamiasciurus fremonti)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Harris's Antelope Squirrel (Ammospermophilus harrisii)
- Rio Grande Ground Squirrel (Ictidomys parvidens)
- Rock Squirrel (Otospermophilus variegatus)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Texas Antelope Squirrel (Ammospermophilus interpres)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
|
| Colorado | 11 |
- Abert's Squirrel (Sciurus aberti)
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Fremont's Squirrel (Tamiasciurus fremonti)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Least Chipmunk (Tamias minimus)
- Rock Squirrel (Otospermophilus variegatus)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
- White-tailed Antelope Squirrel (Ammospermophilus leucurus)
- Wyoming Ground Squirrel (Urocitellus elegans)
|
| Montana | 11 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Columbian Ground Squirrel (Urocitellus columbianus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Golden-mantled Ground Squirrel (Callospermophilus lateralis)
- Least Chipmunk (Tamias minimus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Richardson's Ground Squirrel (Urocitellus richardsonii)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
- Uinta Ground Squirrel (Urocitellus armatus)
- Wyoming Ground Squirrel (Urocitellus elegans)
|
| Wyoming | 11 |
- Abert's Squirrel (Sciurus aberti)
American Red Squirrel (Tamiasciurus hudsonicus)
Eastern Fox Squirrel (Sciurus niger)
Eastern Gray Squirrel (Sciurus carolinensis)
Golden-mantled Ground Squirrel (Callospermophilus lateralis)
Least Chipmunk (Tamias minimus)
Northern Flying Squirrel (Glaucomys sabrinus)
Spotted Ground Squirrel (Xerospermophilus spilosoma)
Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
Uinta Ground Squirrel (Urocitellus armatus)
Wyoming Ground Squirrel (Urocitellus elegans)
|
| Minnesota | 9 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Least Chipmunk (Tamias minimus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Richardson's Ground Squirrel (Urocitellus richardsonii)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| South Dakota | 9 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Least Chipmunk (Tamias minimus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Richardson's Ground Squirrel (Urocitellus richardsonii)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Texas | 9 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Least Chipmunk (Tamias minimus)
- Rio Grande Ground Squirrel (Ictidomys parvidens)
- Rock Squirrel (Otospermophilus variegatus)
- Southern Flying Squirrel (Glaucomys volans)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Texas Antelope Squirrel (Ammospermophilus interpres)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Nebraska | 8 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Southern Flying Squirrel (Glaucomys volans)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
- Wyoming Ground Squirrel (Urocitellus elegans)
|
| North Dakota | 8 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Least Chipmunk (Tamias minimus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Richardson's Ground Squirrel (Urocitellus richardsonii)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Wisconsin | 8 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Least Chipmunk (Tamias minimus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Iowa | 7 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- North American Red Squirrel (Tamiasciurus hudsonicus)
- Richardson's Ground Squirrel (Urocitellus richardsonii)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Kansas | 7 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Least Chipmunk (Tamias minimus)
- Southern Flying Squirrel (Glaucomys volans)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Michigan | 7 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Least Chipmunk (Tamias minimus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Illinois | 6 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Indiana | 6 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Oklahoma | 6 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Rock Squirrel (Otospermophilus variegatus)
- Southern Flying Squirrel (Glaucomys volans)
- Spotted Ground Squirrel (Xerospermophilus spilosoma)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Pennsylvania | 6 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Connecticut | 5 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- North American Red Squirrel (Tamiasciurus hudsonicus)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Missouri | 5 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Franklin's Ground Squirrel (Poliocitellus franklinii)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| New Jersey | 5 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| New York | 5 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| North Carolina | 5 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Ohio | 5 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Southern Flying Squirrel (Glaucomys volans)
- Thirteen-lined Ground Squirrel (Ictidomys tridecemlineatus)
|
| Tennessee | 5 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Virginia | 5 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| West Virginia | 5 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Alaska | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Arctic Ground Squirrel (Urocitellus parryii)
- North American Red Squirrel (Tamiasciurus hudsonicus)
- Northern Flying Squirrel (Glaucomys sabrinus)
|
| Delaware | 4 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- North American Red Squirrel (Tamiasciurus hudsonicus)
- Southern Flying Squirrel (Glaucomys volans)
|
| District of Columbia | 4 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- North American Red Squirrel (Tamiasciurus hudsonicus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Florida | 4 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Red-bellied Squirrel (Sciurus aureogaster)
- Southern Flying Squirrel (Glaucomys volans)
|
| Georgia | 4 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- North American Red Squirrel (Tamiasciurus hudsonicus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Kentucky | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Southern Flying Squirrel (Glaucomys volans)
|
| Maine | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Maryland | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Southern Flying Squirrel (Glaucomys volans)
|
| Massachusetts | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| New Hampshire | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Rhode Island | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| South Carolina | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Southern Flying Squirrel (Glaucomys volans)
|
| Vermont | 4 |
- American Red Squirrel (Tamiasciurus hudsonicus)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Northern Flying Squirrel (Glaucomys sabrinus)
- Southern Flying Squirrel (Glaucomys volans)
|
| Alabama | 3 |
- Eastern Gray Squirrel (Sciurus carolinensis)
- Eastern Fox Squirrel (Sciurus niger)
- Southern Flying Squirrel (Glaucomys volans)
|
| Arkansas | 3 |
- Eastern Gray Squirrel (Sciurus carolinensis)
- Eastern Fox Squirrel (Sciurus niger)
- Southern Flying Squirrel (Glaucomys volans)
|
| Louisiana | 3 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Southern Flying Squirrel (Glaucomys volans)
|
| Mississippi | 3 |
- Eastern Fox Squirrel (Sciurus niger)
- Eastern Gray Squirrel (Sciurus carolinensis)
- Southern Flying Squirrel (Glaucomys volans)
|