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Bucking is a movement performed by a horse or bull in which the animal lowers its head and raises its hindquarters into the air, usually while kicking out with the hind legs. If powerful, it may unseat the rider enough to fall off. ==Reasons for bucking== Bucking, though a potentially dangerous disobedience when under saddle, is a natural aspect of horse behavior. It developed in the wild for the purpose of protection from feline predators such as mountain lions, who would attack horses by dropping onto their backs from above. The process of kicking out with both hind legs, another defense mechanism for the horse, also results in a mild bucking movement. Thus, for a human to safely ride a horse, the horse has to be desensitized to the presence of something on its back and also learn not to kick out with both hind legs while under saddle. Nonetheless, because the instinct is always there, bucking can still occur for a number of reasons: * Happiness, such as when a horse bucks during a gallop because of enjoyment, or during play. * General excitement, such as horses that buck in a crowded schooling ring or at the beginning of a ride in a crowd of horses, such as an endurance ride. * The rider's aids are causing confusion or fear in the horse, and the horse responds by bucking. * The horse is "fresh," having been kept up in a stall for a long period of time, and is releasing pent-up energy. * Pain, which may be due to an ill-fitting saddle or another piece of equipment, tooth problems, or other medical issues. * Provocation, usually due to an insect bite (usually on the hindquarters) which the horse is trying to rid himself of, or in some cases a response to use of a whip on the flank or hindquarters. * Untrained horses may instinctually buck the first few times they have a saddle on the back if not given proper ground training, and occasionally, even with proper preparation. This is an instinctive defense mechanism. * Having found that bucking the rider off results in not having to work, the horse does it to avoid his exercise. * Disobedience to the riding aids, when a horse does not wish to do what is asked by the rider. Sometimes this is due to poor riding on the part of the person, but sometimes a horse attempts to evade a legitimate request by bucking. * Rodeo broncs are used specifically as bucking horses, usually bred to be prone to bucking and encouraged to buck whenever a rider is on their back with the help of a "bucking strap" around their flank. * Fear of loud and noisy machines, like cars, trucks, trains, and planes. In response to the tragic injuries that have resulted, the American courts have uniformly held that "the needs of a modern, industrial society often conflict with and generally must prevail over the delicate sensibilities of horses."〔''Parsons v. Crown Disposal Co.'', (15 Cal. 4th 456 ) (1997).〕 Ordinary riders need to learn to ride out and correct a simple buck or two, because it is a relatively common form of disobedience. Further, at times, movement akin to bucking is actually required of a horse: Horses that are jumping over an obstacle actually are using almost the same action as bucking when launching themselves into the air, it is simply carried out with advanced planning over a higher and wider distance. The classical dressage movement known as the Capriole is also very similar to the low buck done by a horse when it kicks out with both hind legs. 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「bucking」の詳細全文を読む スポンサード リンク
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