Wild Free-Roaming Horses and Burros Act — Federal Protection of Western Herds

Wild horses in the American West have a complicated legal status. They are not wildlife in the traditional sense — their ancestors were domestic horses brought by Spanish explorers and later settlers. They are not livestock — they belong to no one and roam free on public land. For most of U.S. history, they were fair game for capture, slaughter, and sale to dog food companies, their numbers decimated from about two million in the late 1800s to fewer than 20,000 by the 1970s. That changed because of one persistent woman in Nevada. Velma "Wild Horse Annie" Johnston campaigned for nearly two decades to give wild horses federal protection, and in 1971, Congress passed the Wild Free-Roaming Horses and Burros Act with near-unanimous support. The Act declared wild horses and burros "living symbols of the historic and pioneer spirit of the West" and placed them under federal protection on Bureau of Land Management (BLM) and Forest Service lands. Today, the Act governs one of the federal government's most controversial wildlife management programs — the periodic roundup, holding, and adoption of wild horses as their populations outpace the land's carrying capacity — a program that costs taxpayers over $100 million per year and generates intense conflict between ranchers, animal welfare advocates, and budget hawks.

Current Law (2026)

Legal Authority

• 16 U.S.C. § 1331 — Congressional declaration: wild free-roaming horses and burros are "fast disappearing from the American scene" and must be protected "as part of the natural system of the public lands"; Congress declared them under the jurisdiction of the Secretary of the Interior and Agriculture
• 16 U.S.C. § 1332 — Definitions: "wild free-roaming horses and burros" means all unbranded and unclaimed horses and burros on public lands in the United States; must have been present on public lands at the time of the Act's passage in December 1971 to qualify for protection
• 16 U.S.C. § 1333(a) — Protection and management duty: the Secretary "is authorized and directed" to protect and manage wild horses and burros as components of the public lands; must maintain a current inventory; must determine "appropriate management levels" based on rangeland carrying capacity, water, and food availability
• 16 U.S.C. § 1333(b) — Excess removal authority: when horses and burros exceed AML and range is threatened from deterioration, the Secretary must remove excess animals; animals must be placed for adoption or, if not adopted after reasonable efforts, may be sold or destroyed (with significant restrictions on sale)
• 16 U.S.C. § 1334 — Private lands: wild horses straying onto private land must be reported to BLM, which must remove them; only authorized government agents may destroy strays; owners of private land may not kill or harm the animals
• 16 U.S.C. § 1338 — Criminal provisions: felony-equivalent penalties for willfully removing a wild horse from public lands without authority; converting animals to private use; maliciously causing death; willfully harassing by motor vehicle, helicopter, or aircraft; processing into commercial products

How Wild Horse Management Works

BLM manages approximately 177 Herd Management Areas (HMAs) across 10 western states, covering about 27 million acres of public land. Each HMA has an official Appropriate Management Level — a population range within which BLM manages the herd. AMLs are set based on land carrying capacity: how many horses the forage, water, and terrain can support without degrading the ecosystem.

The structural problem is that wild horses reproduce at a rate of about 15–20% per year, while natural predators (wolves, mountain lions) have limited impact on herd sizes across most of the range. Without removal, populations double roughly every 4 years. BLM estimates actual on-the-range populations now exceed AML significantly — with approximately 60,000–80,000 horses on the range in recent years versus an AML ceiling of around 27,000 for all HMAs combined.

Gather operations are BLM's primary management tool. BLM contracts with helicopter pilots to chase horses into portable corrals. The operations are controversial — humane groups document injuries and deaths during gathers, and the sight of helicopters chasing horses is politically charged. After a public hearing requirement and direct supervision, BLM's use of helicopters to remove excess animals is explicitly authorized by the statute.

After gathering, horses go to short-term holding facilities (corrals) and then:

1. Available for adoption through BLM's National Wild Horse and Burro Program ($25 adoption fee)
2. If not adopted within 3 attempts, eligible for sale at $25 per animal (sale authority added in 2005 amendments)
3. May be transferred to long-term holding pastures in the Midwest (where pasture land is cheap) — currently BLM holds over 60,000 animals in long-term facilities, more than are on the range

The holding crisis: Keeping horses in long-term holding facilities currently costs BLM over $50 million per year — more than half the program's budget. This creates pressure to increase adoption rates, use fertility control (PZP vaccines, given by dart gun to mares), and explore alternatives to removal.

The Controversy

The Wild Horses and Burros Act sits at the intersection of several competing interests that make management perpetually difficult:

Livestock operators argue that wild horses compete with cattle and sheep for forage on allotments where they hold grazing permits under the Taylor Grazing Act framework (see Federal Public Lands and BLM for the broader grazing permit framework), and that BLM consistently manages at above-AML populations that damage range condition.

Animal welfare groups argue that removals are inhumane, that AMLs are set too low (disadvantaging horses relative to livestock), and that the program's ultimate goal of population control means BLM is not truly "protecting" wild horses as the statute mandates.

Budget analysts note that the long-term holding costs are unsustainable and that the program lacks a credible path to equilibrium — the backlog of unadopted horses in holding grows faster than adoption rates can clear it.

Western state governments want more influence over decisions made within their state borders, and some advocate for transferring management authority from BLM to states — a debate that recurs across the broader Public Lands Management landscape and through the National Forest System where horses also graze.

Implementing Regulations

The BLM's wild horse and burro management regulations live at 43 CFR Part 4700 — Protection, Management, and Control of Wild Free-Roaming Horses and Burros (44 sections across 6 subparts; implements the Wild Free-Roaming Horses and Burros Act of 1971, 16 U.S.C. §§ 1331–1340). Key provisions:

• § 4700.0-6 — Policy: wild horses and burros shall be managed as self-sustaining populations in balance with other uses and the productive capacity of their habitat; management shall be at the minimum level necessary to achieve and maintain appropriate management levels (AMLs); BLM shall consider the recommendations of qualified scientists and use the best available population inventory data
• § 4710.1 — Land use planning: all management activities affecting wild horses and burros — including establishment of herd management areas (HMAs), AML setting, gather operations, and range improvements — must be integrated with approved resource management plans (RMPs) under FLPMA; HMA boundaries can only be changed through the full RMP revision or amendment process, which requires NEPA analysis and public comment
• § 4710.3-1 — Herd management areas: BLM must establish HMAs for maintenance of wild horse and burro herds; in delineating each HMA, BLM considers the appropriate management level for horses and burros, land use and management requirements for other uses, and the relationship of the HMA to surrounding areas; BLM currently manages approximately 177 HMAs across 10 states
• § 4710.5 — Closure to livestock grazing: if necessary to provide adequate habitat for wild horses or burros or to protect them during a gather, BLM may close areas of public land to livestock grazing — a provision that gives BLM authority to temporarily suspend grazing permits within HMAs, a significant management tool in the ongoing livestock-vs.-horses conflict
• § 4720.1 — Removal of excess animals: when the authorized officer determines an excess of wild horses or burros exists, removal shall be ordered in the following priority: (1) old, sick, or lame animals; (2) mares with recorded multiple foals; (3) other excess animals to bring the herd to AML; removal must be completed as humanely as possible; BLM must give preference to adoption demand and may use helicopters only after providing notice and opportunity for public comment
• § 4730.1 — Destruction: except as an act of mercy, no wild horse or burro may be destroyed without the authorization of the BLM authorized officer; old, sick, or lame animals may be destroyed by the most humane means available; healthy animals that cannot be adopted or transferred may not be destroyed under current BLM policy (though this constraint is statutory, not just regulatory)
• § 4740.1 — Use of motor vehicles and aircraft: motor vehicles and aircraft may be used in all phases of program administration; only helicopters (not fixed-wing aircraft) may be used to chase or drive wild horses and burros; the use of aircraft or motor vehicles to harass or capture animals without authorization is a federal crime under the 1959 "Wild Horse Annie Act" and WFHBA § 1338
• § 4750.3-2 — Qualification standards for adoption: to adopt a wild horse or burro, an individual must be (1) 18 years of age or older; (2) have no prior conviction for inhumane treatment of animals; (3) have adequate facilities to provide humane care — including a corral of at least 400 square feet for the first horse; and (4) not have received more than 4 adopted animals in a 12-month period unless an exception is approved
• § 4750.4-2 — Adoption fee: BLM charges a $125 base adoption fee per animal (the fee was raised from $25 in recent years); BLM may waive or reduce fees to stimulate adoption demand; BLM's Adoption Incentive Program (AIP) has offered up to $1,000 per animal in incentive payments to qualified adopters who commit to gentling, training, and privately maintaining the animal for at least one year
• § 4750.5 — Title transfer: an adopter may apply for title to an adopted wild horse or burro after the animal has been in the adopter's care for at least 1 year and a BLM veterinarian (or designated professional) has certified that the animal has been humanely treated; once title transfers, the animal is private property — no longer a federal animal; title transfer has been controversial because some animals were sold for slaughter shortly after title transfer, prompting congressional and BLM attention to post-title enforcement
• § 4770.1 — Prohibited acts: specifically prohibited are: maliciously or negligently injuring or harassing a wild horse or burro; removing or attempting to remove from public lands without authorization; converting to private use; processing or causing to be processed into commercial products; willfully violating a BLM closure or restriction; penalties include civil fines and criminal prosecution under 16 U.S.C. § 1338

The Part 4700 regulations establish the full lifecycle of BLM's wild horse and burro program — from population monitoring and AML management, through gather operations, to the adoption program and ultimately title transfer to private owners. The regulations explicitly implement the Act's preference for adoption over destruction, which creates the long-term holding crisis: more horses are gathered than can be adopted, so they accumulate in BLM holding facilities. Fertility control programs under § 4700.0-6 (using porcine zona pellucida vaccine, PZP, darted from the ground) are the only tool for reducing the gather-to-adoption imbalance without increasing destruction or sale to slaughter — both of which face intense political and legal resistance.

How It Affects You

If you live in or near BLM wild horse range country (Nevada, Wyoming, Colorado, Utah, Oregon, California, Montana, Idaho, Arizona, New Mexico): You may see wild horse herds on public land near your community. Wild horses on private land are a specific legal issue — you can report strays to BLM, which is required to remove them; you cannot harm or capture them yourself.

If you want to adopt a wild horse: BLM's adoption program offers gentled and unhandled wild horses and burros. Adoption fees are $25. Adopters must have adequate facilities (minimum pen requirements). After one year of satisfactory care, title passes to the adopter. BLM also offers a "Adoption Incentive Program" paying adopters $1,000 after receiving title to encourage uptake.

If you are a rancher with BLM grazing allotments in wild horse territory: The presence of wild horses in your allotment area is managed separately from your grazing permit — but BLM's AML for a given HMA directly affects how many horses compete with your livestock for forage. You can participate in BLM's planning process for HMA management decisions.

If you are interested in wild horse policy: The program is politically active — both animal welfare advocates and livestock interests spend significant resources on BLM rulemaking, budget advocacy, and litigation. The core tension between "protection" and "management" in the statute has never been fully resolved, making ongoing conflict nearly certain. Unlike the Endangered Species Act, the WFRHBA treats wild horses as symbolic resources rather than imperiled wildlife, which is part of why the conservation logic differs so sharply.

State Variations

The Wild Horses and Burros Act is exclusively federal law and covers horses on federal land. Some states have small populations of wild or feral horses on state land — notably in North Carolina (Outer Banks) and Maryland (Assateague Island, which is also a national seashore) — which are managed under state law with separate programs.

Pending Legislation

Congress regularly revisits the Wild Horses and Burros Act in the context of Interior appropriations and public lands legislation. Proposals include expanding fertility control programs (the SAFE Act), creating a comprehensive strategy for long-term holding, and modifying sale authority to create additional disposal options. The core debate — between those who want more active population management and those who want stronger protective standards — has prevented major legislative reform for decades.

Recent Developments

BLM has significantly expanded its use of the Adoption Incentive Program (paying $1,000 per adoption) since 2019, which temporarily increased adoption rates. However, investigations by advocacy groups have found that a significant percentage of horses sold under the AIP are being resold to kill buyers for export to slaughter in Mexico and Canada — a development that has generated congressional scrutiny and legal challenges. BLM has responded with stricter enforcement of AIP conditions but the program remains under pressure. Fertility control via PZP vaccines delivered by dart gun is increasingly used in accessible HMAs as a supplement to roundups.

• BLM overpopulation crisis — 100,000+ horses (2025): BLM's estimated wild horse and burro population reached approximately 82,000 on public lands in 2025 — more than double the Appropriate Management Level (AML) of 26,690 — plus approximately 57,000 animals in off-range holding facilities. Total program costs exceed $130 million annually, with holding costs comprising 60%+ of the budget. The OBBBA included proposals to allow BLM to sell excess horses "without limitation" (effectively authorizing sales to slaughter buyers), which was highly controversial and was removed before final passage after advocacy group opposition.
• Adoption Incentive Program — kill buyer scandal reform: Congressional oversight hearings in 2024-2025 revealed that AIP recipients had resold thousands of adopted horses to slaughter buyers for $300-800 per animal — collecting the $1,000 government incentive before selling to Mexico/Canada slaughter operations. BLM suspended the AIP for new participants in mid-2025 pending program reform. New AIP rules require a 12-month holding period before resale and biannual check-ins with adopters; violation results in permanent AIP disqualification and potential criminal referral under the WFRHBA's sale-to-slaughter prohibition.
• Trump "energy dominance" and HMA reduction: The Trump administration's DOI directed BLM to review Herd Management Area boundaries, with a stated goal of reducing the total HMA acreage to free up land for energy development, livestock grazing expansion, and other uses. Environmental groups challenged several proposed HMA boundary reductions in federal court, arguing that the Wild Free-Roaming Horses and Burros Act prohibits removal from designated HMAs except for overpopulation management. At least three HMA reduction proposals were enjoined pending litigation outcomes.
• GonaCon fertility control — scale-up challenges: BLM has increased use of GonaCon (a fertility control vaccine requiring only one or two doses vs. annual PZP treatment) to reduce roundup frequency in accessible HMAs. However, fertility control can only be effectively applied to horses that can be approached on foot or by helicopter, limiting its use in remote terrain. BLM's 2025 fertility control pilot expanded aerial dart delivery using drones — a first for the program — in the Jackson Mountain HMA (Nevada). Fertility control advocates argue the program needs 10x more funding to make a meaningful dent in population growth rates.