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The most widely known use of horses for sport is horse racing, seen in almost every nation in the world. There are three types: "flat" racing; steeplechasing, i.e. racing over jumps; and harness racing, where horses trot or pace while pulling a driver in a small, light cart known as a sulky. Most race horses in the developed world are Thoroughbreds, a breed which can reach speeds up to . In the case of a specialized sprinting breed, the American Quarter Horse, speeds over have been clocked. In harness racing, performed by Standardbred horses, speeds over have been measured. A major part of the economic importance of horse racing, as for many sports, lies in the gambling associated with it. It is thought that the largest horse in (recorded) history was a Shire horse named Sampson, who lived during the late 1800s. He stood 21.2½ hands high and his peak weight was estimated at . The current record holder for the world's smallest horse is Thumbelina, a fully mature miniature horse affected by dwarfism. She is tall and weighs . Regardless of a horse's actual birthdate, for most competition purposes, horses are considered a year older on January 1 of each year in the northern hemisphere and August 1 in the southern hemisphere. The exception is endurance riding, where the minimum age to compete is based on the horse's actual calendar age. A very rough estimate of a horse's age can be made from looking at its teeth. Colt: a male horse under the age of four. A common terminology error is to call any young horse a colt, when the term actually only refers to young male horses. epending on breed, management and environment, the domestic horse today has a life expectancy of 25 to 30 years. It is uncommon, but a few horses live into their 40s, and, occasionally, beyond. The oldest verifiable record was "Old Billy," a horse that lived in the 19th century to the age of 62. In modern times, Sugar Puff, who had been listed in the Guinness Book of World Records as the world's oldest then-living pony, died at age 56.
For centuries horses have been one of the most economically important domesticated animals, especially relied upon for farmwork and for transportation. Their importance declined following the introduction of mechanization. The history of the horse is prominent in religion, mythology, art, transportation, agriculture, and warfare. Horses and humans have lived and worked together for thousands of years and an extensive specialized vocabulary has arisen to describe virtually every horse behavioral and anatomical characteristic with a high degree of precision. It is thought that the largest horse in (recorded) history was a Shire horse named Sampson, who lived during the late 1800s. He stood 21.2½ hands high and his peak weight was estimated at . The current record holder for the world's smallest horse is Thumbelina, a fully mature miniature horse affected by dwarfism. She is tall and weighs .