American mammoth donkey

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American mammoth donkey
Romulus and Remus 2013.jpg
American Mammoth donkeys
Other names Mammoth Jack (males)
Country of origin United States

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. George Washington, with Henry Clay and others, bred for an ass that could be used to produce strong work mules. Washington was offering his jacks for stud service by 1788. Large breeds of asses were found in Kentucky by 1800.[1]

Breeds that influenced the mammoth jack include the Maltese donkey, Poitou donkey (also sometimes called the mammoth donkey), Andalusian donkey, Majorcan donkey and Catalan donkeys.[2] 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).[3][4]

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,[5] Mammoth Jack stock and Mammoth Jack. These breed designations may encompass females.

The largest living mammoth donkey, at 17 hands (68 inches, 173 cm), resides in Waxahachie, Texas.[6][7]


  1. ^ "The Livestock Conservancy". Retrieved 2017-02-11. 
  2. ^ Bowling, Michael. "THE MAMMOTH JACK". Retrieved 2017-02-11. 
  3. ^ "Breeds of Livestock - Mammoth Jack Stock" Oklahoma State University Archived July 7, 2011, at the Wayback Machine.
  4. ^ "Huge donkey welcomed at Lincolnshire animal sancturary". BBC News. 8 August 2012. Retrieved 8 August 2012. 
  5. ^ "Breed Characteristics". Johnson City, Texas, US: American Mammoth Jackstock Registry. September 24, 2011. Retrieved 2012-03-11. 
  6. ^ Williams, Olivia (March 8, 2013). "Does my ass look big in this? 5 foot, 8 inch Romulus is the world's biggest donkey". Mail Online. Retrieved October 26, 2013. 
  7. ^ "Tallest donkey". Guinness World Records. Retrieved 2017-02-11. 

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