Сollection of Deer wallpapers, 51 images.
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Deer (singular and plural) are the ruminant mammals forming the family Cervidae. Species in the Cervidae family include white-tailed deer, mule deer such as black-tailed deer, elk, moose, red deer, reindeer (caribou), fallow deer, roe deer 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.
Deer weights generally range from 30 to 300 kg (70 to 700 lb), though the smallest species, the Northern Pudú, averages 10 kg (20 lb) and the largest, the moose, averages 431 kg (1,000 lb). They generally have lithe, compact bodies and long, powerful legs suited for rugged woodland terrain. Deer are also excellent jumpers and swimmers. Deer are ruminants, or cud-chewers, and have a four-chambered stomach. The teeth of deer are adapted to feeding on vegetation, and like other ruminants, they lack upper incisors, instead having a tough pad at the front of their upper jaw. Some deer, such as those on the island of Rùm, do consume meat when it is available.
In On the Origin of Species (1859), Charles Darwin wrote "Although I do not know of any thoroughly well-authenticated cases of perfectly fertile hybrid animals, I have some reason to believe that the hybrids from Cervulus vaginalis and Reevesii [...] are perfectly fertile." These two varieties of muntjac are currently considered the same species.
A number of deer hybrids are bred to improve meat yield in farmed deer. American elk (or wapiti) and Red Deer from the Old World can produce fertile offspring in captivity, and were once considered one species. Hybrid offspring, however, must be able to escape and defend themselves against predators, and these hybrid offspring are unable to do so in the wild state. Recent DNA, animal behavior studies, and morphology and antler characteristics have shown there are not one but three species of Red Deer: European red deer, Central Asian red deer, and American elk. The European elk is a different species and is known as moose in North America. The hybrids are about 30% more efficient in producing antlers by comparing velvet to body weight. Wapiti have been introduced into some European red deer herds to improve the Red Deer type, but not always with the intended improvement.