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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).
Unlike the related white-tailed deer (Odocoileus virginianus), mule deer are generally more associated with the land west of the Missouri River, and more specifically with the Rocky Mountain region of North America. Mule deer have also been introduced to Argentina.here available, mule deer also eat a variety of wild mushrooms, which are most abundant in late summer and fall in the southern Rocky Mountains; mushrooms provide moisture, protein, phosphorus, and potassium.