American mammoth redirects here. For the extinct elephant-like animal, see mammoth.

The American mammoth donkey, commonly known as the mammoth jack, American mammoth or American mammoth jack is a landrace of North American donkey, descended from multiple breeds of donkey imported to the United States. Breeds that influenced the mammoth jack include the Maltese donkey, Poitou donkey (itself also sometimes called the mammoth donkey), Andalusian donkey, Majorcan donkey and Catalan donkeys.^[1] Males, called jacks, must be at least 14 hands (56 inches, 142 cm) and females, called jennies or jennets must be at least 13.2 hands (54 inches, 137 cm).^[2][3]

Purebred and pedigreed specimens of the variety that conform to a published standard of characteristics are considered a formal breed, registered with the American Mammoth Jackstock Registry, commonly called by various names including American Mammoth Jackstock',^[4] Mammoth Jack stock and Mammoth Jack. These breed designations may encompass females.

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