Deer

Deer (singular and plural) are the ruminant mammals forming the family Cervidae. Species in the family include white-tailed deer, mule deer such as black-tailed deer, elk, moose, red deer, reindeer (caribou), fallow deer, roe deer, pudú and chital. Male deer of all species (except the Chinese water deer) and also female reindeer grow and shed new antlers each year. In this they differ from permanently horned animals such as antelope; these are in the same order as deer and may bear a superficial resemblance. The musk deer of Asia and water chevrotain (or mouse deer) of tropical African and Asian forests are not usually regarded as true deer and form their own families, Moschidae and Tragulidae, respectively.
==Species==
===White-tailed deer===
The white-tailed deer (Odocoileus virginianus), also known as the Virginia deer or simply as the whitetail, is a medium-sized deer native to the United States, Canada, Mexico, Central America, and South America as far south as Peru. It has also been introduced to New Zealand and some countries in Europe, such as Finland, Czech Republic, and Serbia. In the Americas, it is the most widely distributed wild ungulate.
===Black-Tailed Deer===
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.
===Elk===
The elk (Cervus canadensis) is one of the largest species of the Cervidae or deer family in the world, and one of the largest land mammals in North America and eastern Asia.
====Diseases====
Elk are susceptible to a number of infectious diseases, some of which can be transmitted to livestock. Efforts to eliminate infectious diseases from elk populations, largely through vaccination, have had mixed success.
====Diet====
Elk are ruminants and therefore have four-chambered stomachs. Unlike white-tailed deer and moose which are primarily browsers, elk have a similarity to cattle as they are primarily grazers, but like other deer, they also browse. Elk have a tendency to do most of their feeding in the mornings and evenings, seeking sheltered areas in between feedings to digest. Their diets vary somewhat depending on the season with native grasses being a year round supplement, tree bark being consumed in winter and forbs and tree sprouts during the summer. Elk consume an average of 9.1 kilograms (20 lb) of various vegetation daily. Particularly fond of Aspen sprouts which rise in the spring, elk have had some impact on Aspen groves which have been declining in some regions where elk exist.
===Mule Deer===
The mule deer (Odocoileus hemionus) is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule. There are believed to be several subspecies, including the black-tailed deer. 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.
===Fallow Deer===
The fallow deer (Dama dama) is a ruminant mammal belonging to the family Cervidae. This common species is native to western Eurasia, but has been introduced widely elsewhere.
==Habitat==
Deer are widely distributed, with indigenous representatives in all continents except Antarctica and Australia, though Africa has only one native species, the red deer, confined to the Atlas Mountains in the northwest of the continent. However, fallow deer have been introduced to South Africa.
==Physical Features==
===Antlers===
With the exception of the Chinese water deer, which have tusks, all male deer have antlers. Sometimes a female will have a small stub. The only female deer with antlers are reindeer (caribou). Antlers grow as highly vascular spongy tissue covered in a skin called velvet. Before the beginning of a species' mating season, the antlers calcify under the velvet and become hard bone. The velvet is then rubbed off leaving dead bone which forms the hard antlers. After the mating season, the pedicle and the antler base are separated by a layer of softer tissue, and the antler falls off.
===Color===
====Piebald deer====
A piebald deer is a deer with a brown and white spotting pattern which is not caused by parasites or diseases. They can appear to be almost entirely white. In addition to the non-standard coloration, other differences have been observed: bowing or Roman nose, overly arched spine (scoliosis), long tails, short legs, and underbites.
220px-PiebaldFawn.jpg
220px-Piebald_deer.jpg
====White deer====
White tail fawns are born a brown or tan color with a spotted white pattern. Sometimes these fawns can be born with a grey appearance, making them seem dirty. The coats then become pure white in the middle of their second year, sometimes mistaken for albino deer.
Albino whitetail deer appear to have pink skin with a pure white coat, and the irises are usually pink as well. There is no such thing as a partial albino, true albino deer have little or no melanin in their bodies. Their color is mainly white because it lacks any pigments, making the skin appear pink because the flowing blood can be seen through the skin. Their white coats make them especially vulnerable to predators
Category:Deer
Category:Animals
Category:Mammals
Category:Herbivores