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The tail of the horse and other equines consists of two parts, the dock and the skirt. The dock consists of the muscles and skin covering the coccygeal vertebrae. The term "skirt" refers to the long hairs that fall below the dock. On a horse, long, thick tail hairs begin to grow at the base of the tail, and grow along the top and sides of the dock. In donkeys and other members of ''Equus asinus'', as well as some mules, the zebra and the wild Przewalski's horse, the dock has short hair at the top of the dock, with longer, coarser skirt hairs beginning to grow only toward the bottom of the dock. Hair does not grow at all on the underside of the dock. The tail is used by the horse and other equidae to keep away biting insects, and the position and movement of the tail may provide clues to the animal's physical or emotional state. Tail carriage may also be a breed trait. Tails of horses are often groomed in a number of ways to make them more stylish for show or practical for work. However, some techniques for managing the tails of horses are also controversial and may constitute animal cruelty. ==Communication and behavior== The tail can communicate basic information about the horse's physical condition or state of mind. A high-carried tail often reflects high spirits, while a tail tucked in tightly to the buttocks often indicates discomfort. A horse will carry its tail higher and farther from its body the faster it goes. A horse must also raise its tail to defecate, and certain digestive disorders, such as gas colic, may include the clinical sign of the tail being carried higher and farther from the body than is typical for a particular animal. A horse that is irritated or unhappy may violently swish its tail from side to side, and an extremely angry animal may go so far as to wring its tail up and down as well as side to side. A horse that is content will usually have the dock of the tail in a relaxed state, not moving other than to sway with the natural movement of the animal. In cold weather, horses may stand with their hindquarters facing into the wind and their tails clamped tightly to their buttocks in order to protect their bodies from the weather. If veterinary treatment involves inspection of the anus, or in a mare, the vagina, the horse may clamp down its tail in order to protect these sensitive regions, though a human handler is usually able to move the tail away by bringing it sideways. A horse may stomp its hind feet and swish its tail as a precursor to kicking, but sometimes the tail movement and the actual kick come in quick succession before the recipient of the kick is able to avoid it. A horse that is about to buck may sometimes tense and curve or "kink" its tail in a distinctive fashion, although this action will not be visible to the rider, who is generally facing forward. When in harness or under saddle, the horse may express displeasure or resistance to a handler's commands, particularly a rider's leg command to move forward, by twisting or wringing its tail. The use of spurs may result in particularly strong expressions of irritation. Because tail-swishing can indicate a horse resistant to a rider's commands, the practice is generally penalized at horse shows in events where manners or responsive performance are judged. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tail (horse)」の詳細全文を読む スポンサード リンク
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