< 4-Legged Critters
Deer

Deer

Deer first appeared in Asia about 38 million years ago. Today, they are found throughout the Americas, Europe, Asia and North Africa. These hoofed mammals are usually characterized by bony, often branching antlers that are shed and regenerated annually. They range in size from the impressive European elk, (also called moose) which may be as tall as 7.7 feet at the shoulder, to the tiny South American Pudu, which is the size of a medium dog – about 10 inches at the shoulder. Whitetail deer, the most common species in America, measure between 3 and 3 ½ feet at the shoulder. Males weigh as much as 400 pounds; females weigh 70 – 200 pounds.

Whitetails are known for their tined antlers and flag-like tail with its prominent white underside. The color of its upper body and sides changes with the seasons, from reddish-brown in summer to buff or gray in winter. The belly and underside of the tail are completely white, and there is a white patch on the throat. Deer shed their hair twice a year; in spring, a heavy winter coat gives way to a lighter one that is replaced again in early fall.

Deer eat woody vegetation as well as leaves, grass, buds, berries, bark, wild grapes, apples, sunflowers and acorns. Croplands are a reliable year-round food source, and provide cover from July until harvest, when deer retreat to permanent cover for protection from weather and predators. In some areas, more than 50% of the whitetail’s year-round food comes from crops.

Habits & Habitat

Deer are most plentiful in mixed wooded and open land; they also live in swamps, on mountains, and northern tundra regions. In many areas, the best deer habitat is along streams, where deciduous trees provide woody cover. Grasslands and marshy vegetation are also suitable if the topography provides concealment. Former crop-producing lands that are under long-term retirement have increased whitetail distribution in recent years.

Deer Facts & Features

Parenthood

Healthy whitetail deer are prolific breeders. At least half of all female fawns breed by age 6 months. Breeding begins in mid-October; it peaks in mid-to-late November for adults, and about one month later for fawns. Bucks mate with several does each year, with as many as 20 having been noted under pen conditions. After a gestation period of about 201 days, fawns are born from early May through late September with about 60% of the total born in June. Virtually all adult deer produce young, generally a single fawn in a year. About 10% produce twins. When does are older, the bearing of twins increases to 67%; 21% have single fawns and 12% have triplets. Approximately 140 fawns are born for every 100 does in the population.

Birth weight for female fawns averages 5 ½ pounds; males average 7 ½ pounds. The fawn can walk shortly after birth, but stays close to its mother for several days. A fawn's coat is similar to an adult's, but has several hundred white spots along the back. This dappling provides camouflage in the shadows and thickets beneath trees. The spots gradually disappear when the deer is three to four months old.

At 2 – 3 weeks of age, fawns begin eating vegetation in addition to nursing. They are weaned at about four months, but can survive without milk at three months or less. About 30% of fawns do not survive until fall.

Antlers

Only bucks have antlers. Rack development is controlled by the male sex hormone but also depends on nutrition and sunlight levels. Antler growth begins in late winter/early spring as tiny fuzz-covered buds, which actually push out the old antlers, just as adult teeth push out baby teeth in humans. Very fine-haired skin, called velvet, protects the antler as it grows. Early autumn sunsets cause testosterone to rise in the buck’s body and signals velvet deterioration. As the luxuriant skin dies, it dries and itches, causing bucks to scratch by running their antlers along any available surface. By the time breeding season arrives, antlers are smooth and ready for battles with other males for breeding rights.

Importance of Deer

In addition to sport and meat (venison), deer contributions to society include:

On the negative side, deer:

References

  1. “Deer,” Microsoft® Encarta® Online Encyclopedia 2001 http://encarta.msn.com © 1997-2000 Microsoft Corporation. All Rights Reserved.

  2. The University of Michigan Museum of Zoology Animal Diversity Web

  3. Nebraska Parks Commission