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Scroll below to find a wealth of information on the wild horse and burro issue. 

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Resources & References



Using Science to Improve the BLM Wild Horse and Burro Program

In 2013, the National Academies of Science released a comprehensive report - paid for by the Bureau of Land Management - on ways to utilize science for the improvement of the national Wild Horse and Burro Program. This landmark study has provided invaluable data and statistics regarding the care and keeping of our wild horses and burros. 

Comprehensive Animal Welfare Program for Wild Horse and Burro Gathers

Animal welfare assessment standards for roundups are detailed in this paper, this is useful to reference when animal cruelty abuse and deaths occur during a BLM roundup. (Click Here)


PZP Position Papers and Studies

  • Position of The Cloud Foundation on the Use of Porcine Zona Pellucida (PZP) by Ginger Kathrens, 9.2014 (Click Here)

  • Genetic Analysis of the Pryor Mountains Wild Horse Range, MT by E. Gus Cothran, 8.22.2013 (Click Here)

  • Immunocontraceptive Reproductive Care Contro | Utilizing Porcine Zona Pellucida (PZP) in Feral Wild Horse Populations by J.F. Kirkpatrick, Ph.D., Allen T. Rutberg, Ph.D., and Linda Coates-Markle, 2010 (Click Here)

  • Journal of Reproductive Immunology, The Practical Side of Immunocontraception by J.F. Kirkpatrick, 2009 (Click Here)

  • Achieving Population Goals in Long-Lived Wildlife Species with Contraception (Wildlife Research)
    by Kirkpatrick and Turner, 2008 (Click Here)

  • The Vaccine that could Save the Range: PZP and Mustangs (Horse Nation interview with Jay F. Kirkpatrick)
    by Kristen Kovach, 7.17.2015 (Click Here)


  • The Cloud Series (3 Books) by Ginger Kathrens (View in Our Store)

  • America's Last Wild Horses: A Classic Study of the Mustangs and their Pivotal Role in the History of the West by Hope Ryden (View on

  • The Horse Lover: A Cowboy's Quest to Save the Wild Mustang by H. Alan Day and Lynn Wiese Sneyd (View on

  • Wild At Heart: Mustangs & The Young People Fighting to Save Them by Terri Farley (View on

  • Welfare Ranching: The Subsidized Destruction of the American West by George Wuerthner (View on

  • Wild Horse Annie: Velma Johnston and Her Fight to Save the Mustangs by Alan J. Kania (View on

  • Wild Horses of the West: History and Politics of America's Mustangs by J. Edward de Steiguer (View on

The Wild Free-Roaming
Horses and Burros
Act of 1971


"That Congress finds and declares that wild free-roaming horses and burros are living symbols of the historic and pioneer spirit of the West; that they contribute to the diversity of life forms within the Nation and enrich the lives of the American people; and that these horses and burros are fast disappearing from the American scene."

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Wild Horses as a
Returned Native Species

A common argument from the opposition to our wild horses and burros is that these animals are not native to North America and can, therefore, be damaging to the habitat. The following articles present evidence that wild horses and burros are native to this continent, and evolved here. 


The Wild Horse is a Native species to North america

By Ross MacPhee, Ph.D., Curator - Division of Vertebrate Zoology, American Museum of Natural History


Wild Horses as Native North American Wildlife

Statement for the 109th Congress in support of H.R. 297. By Jay F. Kirkpatrick, Ph.D. and Patricia M. Fazio, Ph.D.



Published by Horse Talk NZ

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Published by Science Daily
December 15, 2009



A common argument of the wild horse and burro opposition forces is that our horses and burros have a negative impact on our rangelands. When examined more closely, it is clear that it is livestock who are significantly impacting rangeland health, something not often admitted or examined by the managers of our public lands.

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Positive Impacts of
Wild Horses

Wild horses and burros have been shown to be beneficial to their habitats in many ways. Scientific studies have found them to be "positively contributing" returned natives in North America. There have been studies done internationally on the benefit of wild horses and burros to their respective ecosystems. Read more below.

The Horse and Burro as positively Contributing Returned Natives
by Craig Downer, published in American Journal of Life Science 1.30.2014

Proposal for Wild Horse/Burro Reserve Design as a Solution to Present Crisis
by Craig Downer, Natural Horse Magazine, 10.2010

Rewilding Horses in Europe Background and guidelines – a living document By Leo Linnartz, ARK Nature and Renee Meissner, Herds & Homelands,2014

How Wild Horses & Burros Help North American Ecosystems
by Craig Downer

Public Lands 


No land, no horses and burros. Without the beautiful public lands in the American West, our wild horses and burros would have nowhere to go. That's why The Cloud Foundation keeps a close eye on developments nationwide affecting our public lands and the wildlife who lives on them.

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By The Numbers

Population Data

Using BLM’s own data, Wild Horse advocates C.R. MacDonald and Lisa LeBlanc charted out how many wild horses could be truly left in the wild. Click on each photo to view them full screen.

The BLM Wild Horse & Burro Program

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Wild Horse Myths