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Mule Deer[1]
Male and Female
Conservation status
Least Concern (IUCN 3.1)[2]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Family:	Cervidae
Subfamily:	Capreolinae
Genus:	Odocoileus
Species:	O. hemionus
Binomial name
Odocoileus hemionus (Rafinesque, 1817)

The mule deer (Odocoileus hemionus) is a deer whose habitat is in the western half of North America. It gets its name from its large mule-like ears. Adult male mule deer are called bucks, adult females are called does, and young of both sexes are called fawns. The black-tailed deer is considered by some a distinct species though it is classified as a subspecies of the Mule Deer. Unlike its cousin, the white-tailed deer, mule deer are generally more associated with the land west of the Missouri River. The most noticeable differences between whitetails and mule deer are the color of their tails and configuration of their antlers. The mule deer's tail is black tipped. Mule deer antlers are bifurcated, or "fork" as they grow rather than branching from a single main beam (as with white-tails). Each year a buck's antlers start to grow in spring and are shed after mating season from mid-January to mid-April. Mule deer bucks have somewhat more prominent ears than females. Instead of running, mule deer move with a bounding leap (stot), with all four feet coming down together.

The mule deer is the largest of the Odocoileus genus, standing, on the average, 40 to 42 inches at the shoulders and stretching 80 inches or so nose to tail. An adult buck will weigh from 150 to 300 pounds on the hoof, with does averaging 125 to 175 pounds. The occasional trophy-sized mule deer buck may weigh in around 500 pounds.[1] The Mule Deer does not show marked size variation across its range as does the White-tailed Deer.

Seasonal behaviors

In addition to movements related to available shelter and food, the breeding cycle is important in understanding deer behavior and personality. The "rut" or mating season usually begins in the fall as does go into estrus for a period of a few days and males become more aggressive, competing for mates. Does may mate with more than one buck and go back into estrus within a month if they do not settle. The gestation period is about 190–200 days, with fawns born in the spring, staying with their mothers during the summer and being weaned in the fall after about 60–75 days. A buck's antlers fall off during the winter, to grow again in preparation for the next season's rut. For more information see main article on deer.

There are several non-human predators of mule deer. Gray Wolves and Cougars are the main predator of adult deer. Bobcats, Coyotes, American Black Bears and Grizzly Bears less commonly prey on adult deer, though commonly attack fawns.^[3]

Foraging

In summer, it chiefly forages on not only herbaceous plants, but also various berries (including blackberry, huckleberry, salal, and thimbleberry). Mule deer are known to forage in summer on California Buckeye leaves, even though there is some evidence of that plant's toxicity.^[4] In winter, it forages on conifers (especially twigs of Douglas fir, cedar, Taxus yews, aspen, willow, dogwood, serviceberry, juniper, and sage). In season, it eats acorns and apples.

Mule Deer grazing in Zion National Park.

Mule Deer buck in Rocky Mountain Arsenal National Wildlife Refuge.

A Mule Deer doe grazing near the Devon Lakes.

Mule deer prefer to eat high amounts of fresh grass and populations tend to move up or down with those of their preferred foods. Mule deer rarely travel far from water or forage, and tend to bed down within easy walking distance of both. Young mule deer tend to forage together in family groups while bucks tend to travel alone or with other bucks. Most actively foraging around dawn and dusk, they tend to bed down in protected areas mid-day, but will also forage at night in more open agricultural areas, during full moons, or when pressured by hunters. Repeated beds will often be scratched level, about the size of a washtub. Temporary beds will seem little more than flattened grassy grounds.

Classification

• Family Cervidae
  • Genus Odocoileus
    • Species Odocoileus hemionus (western and central North America)
      • Odocoileus hemionus californicus (California mule deer)
      • Odocoileus hemionus cerrosensis (Cedros (Cerros) Island mule deer)
      • Odocoileus hemionus columbianus (Columbian black-tailed or coast deer, British Columbia to northern California)
      • Odocoileus hemionus crooki (Desert mule deer, north Mexico)
      • Odocoileus hemionus eremicus (Burro deer, northwest Mexico and Arizona)
      • Odocoileus hemionus fuliginatus (Southern mule deer, California)
      • Odocoileus hemionus inyoensis (Inyo mule deer, California)
      • Odocoileus hemionus peninsulae (Peninsula mule deer, Baja, California)
      • Odocoileus hemionus sheldoni (Tiburon Island mule deer, Tiburon Island)
      • Odocoileus hemionus sitkensis (Sitka deer, coastal area and islands off western British Columbia)
      • Odocoileus hemionus hemionus (Rocky Mountain Mule Deer, western and central North America)

Line notes

References

• Odocoileus hemionus (TSN 180698). Integrated Taxonomic Information System. Retrieved on 23 March 2006.

External links

• Smithsonian National Museum of Natural History species account-Mule Deer
• Arizona Mule Deer
• The Deer of North America