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July 26, 2026Sources cited
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Science & Nature • Horse Breed

Mustang

The Mustang is a free-roaming horse of the western United States descended from horses brought to the Americas by Spanish explorers and settlers.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

The Mustang is a free-roaming horse of the western United States descended from domesticated horses brought to North America by Spanish explorers and settlers. Because its ancestors were domesticated, the Mustang is generally classified as a feral horse rather than a truly wild horse. The term is also used more broadly for free-roaming horses in North America, and free-roaming mustang populations in the United States are managed and protected by the Bureau of Land Management.

Origin and history

Mustangs trace their origins to horses brought to North America by Spanish explorers and settlers. Over time, escaped and released horses established free-roaming populations across the western United States. Modern mustangs show mixed ancestry from multiple horse breeds, not only the original Colonial Spanish horses.

Classification and terminology

Mustangs are often referred to as wild horses, but in scientific and historical terms they are classified as feral horses because they descend from domesticated stock. The name 'mustang' is associated with Spanish terms for stray or wild animals.

Physical traits

Breed descriptions commonly characterize mustangs as medium-sized, sturdy horses with strong hooves and substantial variation in coat color and body type. Reported measurements vary by population, but many sources place them around 14 to 15 hands tall and about 800 pounds.

Management and conservation

In the United States, free-roaming mustangs are subject to federal management, with populations on public lands overseen by the Bureau of Land Management. This management has made the mustang a well-known symbol of the American West.

Key facts

  • Mustangs are feral horses descended from domesticated horses introduced by Spanish explorers.
  • They are found mainly in the western United States.
  • Although often called wild horses, mustangs are classified as feral because they descend from domesticated animals.
  • Modern mustangs show mixed ancestry from multiple horse breeds, not only Colonial Spanish horses.
  • Free-roaming mustang populations in the United States are managed and protected by the Bureau of Land Management.
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Canadian context

Mustangs are relevant to Canadian readers as a well-known North American horse type and a frequent subject of horse-breeding, equine history, and conservation discussions; they also appear in Canadian equestrian media and breed references.[12]

Frequently asked questions

What is a Mustang horse?
A Mustang is a free-roaming horse of the western United States descended from domesticated horses brought by Spanish explorers.
Are mustangs wild or feral?
Mustangs are generally considered feral, not truly wild, because they descend from domesticated horses.
Where do mustangs live?
Mustangs live mainly in the western United States, especially on public lands.
What breeds are mustangs related to?
The original mustangs were Colonial Spanish horses, but modern mustangs have mixed ancestry from several horse breeds.
How big is a Mustang horse?
Many breed guides place mustangs around 14 to 15 hands tall and about 800 pounds, though size varies by population.
Who manages free-roaming mustangs in the U.S.?
Free-roaming mustangs on U.S. public lands are protected and managed by the Bureau of Land Management.

References

  1. Mad Barnhttps://madbarn.com/mustang-horse-breed-guide/
    Supports: Mustang as a feral horse of the western United States descended from horses introduced by Spanish explorers.
  2. Horse Breeds Pictureshttps://www.horsebreedspictures.com/mustang-horse.asp
    Supports: Mustang description, western U.S. free-roaming populations, and BLM protection mention.
  3. The Horse and Stablehttps://thehorseandstable.com/horse-breeds/mustang-horse-guide/
    Supports: Height, weight, colors, lifespan, and Spanish-origin summary.
  4. Wikipediahttps://en.wikipedia.org/wiki/Mustang
    Supports: Mustangs as feral horses, Spanish-conquistador origin, and mixed ancestry of modern mustangs.
  5. The Spruce Petshttps://www.thesprucepets.com/mustang-horse-breed-profile-5080174
    Supports: Mustangs as feral horses in the western United States and origin from Spanish horses.
  6. Live Sciencehttps://www.livescience.com/27686-mustangs.html
    Supports: Descendants of escaped Spanish horses, feral classification, and general characteristics.
  7. Oklahoma State Universityhttps://breeds.okstate.edu/horses/mustang-horses
    Supports: Mustang as a feral horse found in the western United States.
  8. Mustang Heritage Foundationhttps://www.mustangheritagefoundation.org/learn
    Supports: Common term for wild horses in the United States.