Sciurus niger (fox squirrel) Sciurus carolinensis (eastern gray squirrel) Sciurus griseus (western gray squirrel) Tamiasciurus hudsonicus (American red squirrel) Tamiasciurus douglasii (Douglas' squirrel) Tamias minimus (Least Chipmunk) Urocitellus richardsonii (Richardson's ground squirrel) Urocitellus parryii (Arctic ground squirrel) Otospermophilus beecheyi (California ground squirrel) Spermophilus tridecemlineatus (thirteen-lined ground squirrel) Cynomys ludovicianus (black-tailed prairie dog) Marmota flaviventris (yellow-bellied marmot)