Originally The American Mammoth Donkey was bred from Maltese, Poitou, Andalusia and Catalonian breeds and developed in the United States of America. By 1915 the American Jack Stock were considered to be the finest in the world, developed primarily for producing excellent mules for work and riding.
The male donkey a jack should be at least 58 inches (147 centimetres) high, while females are called jennets or jennies start at 56 inches upwards.
The Mammoth donkey is still today classified as rare by the American Livestock Breeds Conservancy, with less than a thousand registrations annually.
