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The eastern edge of the mule deer's range is southwestern Saskatchewan. Odocoileus hemionus and its subspecies are common to Alaska, British Columbia, Alberta, North Dakota, South Dakota, Nebraska, Kansas, Colorado, Utah, New Mexico, Arizona, Nevada, California, Oregon, Washington, and western Oklahoma (Wallmo 1981).docoileus hemionus and its subspecies are common to Alaska, British Columbia, Alberta, North Dakota, South Dakota, Nebraska, Kansas, Colorado, Utah, New Mexico, Arizona, Nevada, California, Oregon, Washington, and western Oklahoma (Wallmo 1981).
Mule Deer. Posted on January 29, 2011 by Yellowstone Net. Mule deer, also known as black-tail deer, are ideally suited to the rugged slopes of the Rocky Mountains. A large number inhabit the park in summer, but most migrate to lower elevations, or âwinter rangeâ outside the park in the winter.tudies have documented mule deer in the Rockies that eat over 600 different species of plants. They feed on grasses during spring and summer, and on branches of trees and shrubs in winter. Palatable grasses and shrubs now flourish in many of the areas burned by the 1988 fires.