The Thoroughbred is a breed of horse first developed during the 17th and 18th centuries in England, by crossbreeding Arabians with native horses to produce superior racing horses. The Thoroughbred has been called the ultimate work of art ever produced by man, and has a height of around 160 to 170cm (to the shoulders), weighing between 450 and 500kg. Its well-developed chest and hindquarters make it a fast runner. It can run at speeds of up to 60 or 70km/h for minutes on end, even with a 50kg rider on its back. However, its thin legs are prone to injuries. In terms of temperament, it is a very delicate horse, sensitive to loud noises and bright lights.