The Arabian horse is a breed of horse with a reputation for intelligence, high spirit, and outstanding stamina. It is one of the oldest breeds, with ancestry dating to the ancient world. With a distinctively chiseled head and high tail carriage, the Arabian is one of the most easily recognizable horse breeds in the world. Arabian bloodlines are found in the ancestry of almost every modern breed of riding horse. Because of the genetic strength of the desert-bred Arabian horse, it has played a part in the development of many breeds, including the Thoroughbred, American Quarter Horse, Morgan, American Saddlebred, Appaloosa and Warmblood breeds such as the Oldenburg and the Trakehner. Arabian bloodlines have also influenced the development of the Welsh Pony and the Percheron draft horse.