Mammal · GBIF taxon 2440891
Mammoth Jackstock
Equus asinusAlso known as American Mammoth Jackstock, American Mammoth Jack, Mammoth Jack
American Mammoth Jackstocks are the world's largest donkey breed, originally developed in North America by crossing imported European breeds to sire powerful draft mules. Renowned for their calm demeanor and exceptional size, these giant equines combine impressive strength with keen intelligence. Their dense coats and resilient digestive systems reflect their desert heritage, enabling them to thrive on coarse forage.
DomesticWorking AnimalLarge Breed
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Diet & prey
- Grasses, hay, and forage crops
Predators
- Wolves
- Cougars
ThreatsReduced demand for traditional draft livestock
HabitatsPastures, agricultural lands, and ranches
Life span30–40 years
Size / weightNot available
Classification
- OrderPerissodactyla
- FamilyEquidae
- GenusEquus
- SpeciesEquus asinus
Range data is not available yet.
Interaction riskHigh
- Low
- Moderate
- High
- Very high
- Why interaction risk is high
- Large equine capable of powerful kicks and bites; approach calmly with owner permission.
- Why it is dangerous
- Weighing several hundred kilograms, these large animals can inflict serious blunt force trauma through kicks or defensive bites if frightened.
- How to recognize a risky encounter
- Identified by tall frame standing over 14 hands high, broad head, and extremely long ears.
- What to do
- Always ask the owner before approaching, and never walk in blind spots directly behind or in front of the face.
Responsible observation
- Approach visibly: Walk up to the shoulder slowly while speaking gently to avoid startling the animal.
- Mind the hindquarters: Avoid standing directly behind or beneath the legs to stay clear of kicks.
- Observe ear placement: Ears pinned flat back signal annoyance or defensive intent.
Hybrid Parent (c) Meghan Cassidy, some rights reserved (CC BY-SA) · cc-by-sa
Wild Ancestor H. Zell / CC BY-SA 3.0 · cc-by-sa
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