Two forms of black-tailed deer or blacktail deer that occupy coastal temperate rainforests in the Pacific Northwest are subspecies of the mule deer (Odocoileus hemionus). They have sometimes been treated as a species, but virtually all recent authorities maintain they are subspecies. The Columbian black-tailed deer (Odocoileus hemionus columbianus) is found in western North America, from Northern California into the Pacific Northwest and coastal British Columbia. The Sitka deer (Odocoileus hemionus sitkensis) is found coastally in British Columbia, Southeast Alaska and Southcentral Alaska (as far as Kodiak Island).