We report the first records of the western gray squirrel (Sciurus griseus) from Modoc County and eastern Lassen County in northeastern California. Specimens from Modoc County represent the first records of the species from the Great Basin geographic province. We conclude that these records represent a range expansion based upon previous fieldwork that did not report the species in the region.
Matson, John O.; Laudenslayer, William F. Jr.; Trewhitt, Stephanie A.; and Flores, Mary
"Range expansion of the western gray squirrel (Sciurus griseus) in northeastern California,"
Western North American Naturalist: Vol. 70
, Article 19.
Available at: http://scholarsarchive.byu.edu/wnan/vol70/iss2/19