Black-tailed deer or blacktail deer occupy coastal regions of western North America. There are two subspecies, the Columbian black-tailed deer (Odocoileus hemionus columbianus) which ranges from the Pacific Northwest of the United States and coastal British Columbia in Canada[1] to Santa Barbara County in Southern California,[2] and a second subspecies known as the Sitka deer (O. h. sitkensis) which is geographically disjunct occupying from mid-coastal British Columbia up through southeast Alaska, and southcentral Alaska (as far as Kodiak Island).[1][3][4][5] The black-tailed deer subspecies are about half the size of the mainland mule deer (Odocoileus hemionus hemionus) subspecies, the latter ranging further east in the western United States.[6] Blacktail deer are a distinct species and the predecessor to the mule deer, which is a hybrid of blacktail deer and whitetail deer.[7][8][9][10][11][12][13]
^ abB.C. Ministry of Env., Lands & Parks. (Undated) Mule and black-tailed deer in British Columbia.
^William P. Dasmann (1975). Big Game of California. Sacramento, California: California Fish and Game. p. 58.