How other countries manage feral and wild horse populations — and what their choices reveal about our own.
The United States is not the only country grappling with what to do when a horse population exceeds what its landscape can carry. Australia has aerial-culled tens of thousands of brumbies from alpine national parks. New Zealand has built a working contraception program around a herd capped at 300. Mongolia and Kazakhstan are engaged in the opposite project entirely — actively reintroducing the world's last truly wild horse species to steppes from which it was hunted to extinction. Each case operates under different legal structures, ecological contexts, and cultural pressures. None maps cleanly onto the American situation. But together they make visible some of the assumptions built into U.S. policy that are rarely examined: that horses are a management problem to be held in place rather than a population to be actively shaped; that the only tools are removal and holding; and that the emotional weight of the issue is a distortion to be managed rather than a signal worth listening to.
What follows is not a ranking of approaches. It is a set of reference points. The U.S. has the largest feral horse population in the developed world, the most restrictive legal framework governing management options, and the largest backlog of animals in off-range holding at public expense. Other countries have made different tradeoffs. Understanding those tradeoffs concretely — what they cost, what they achieved, and what they left unresolved — is the starting point for any honest conversation about what a better path forward might look like.
Australia has the largest feral horse population in the world — estimated at up to 400,000 animals across the Northern Territory, Queensland, and alpine New South Wales. The most politically contested subset, known as brumbies, live in the Australian Alps, where they were first reported in the 1830s and have since become a significant ecological and cultural flashpoint.
Kosciuszko National Park in New South Wales became the center of a prolonged management battle. A 2018 state law inserted the concept of "heritage value" into the management framework, effectively giving brumby advocates political standing to block culls and demand trapping and rehoming as alternatives. Population numbers climbed as a result — from roughly 1,700 in 2005 to estimates ranging between 12,900 and 22,500 by 2023. In October 2023, after years of failed non-lethal control, the NSW government reversed course and approved aerial shooting from helicopters. In 2025, the 2018 heritage protections were repealed, and all control methods are now approved to reduce the population to a target of 3,000 animals in 32% of the park by June 2027. Between October 2023 and October 2024, AUD $8.2 million was spent removing approximately 8,000 horses.
The brumby conflict mirrors the American one structurally: urban publics with cultural attachments to the horse as a symbol overrode the judgment of ecologists and park managers for years, allowing the problem to compound until only the most extreme option was left. Rangers conducting culls have faced harassment and threats. The Senate inquiry noted that it is "not currently possible" for both the heritage protections and the ecological management obligations to be satisfied simultaneously — a finding that applies with equal force to the American statutory framework.
New Zealand's Kaimanawa horses are a feral population descended from domestic breeds released into the North Island's Kaimanawa Ranges beginning in the 1870s. The New Zealand government granted them protected status in 1981, and the population grew from around 174 animals to 1,576 by 1994. The rapid increase, and the ecological damage it produced in a landscape with 16 endangered plant species, prompted the Department of Conservation to begin annual musters in 1993.
The management model since then has centered on a hard population cap — currently around 300 horses — enforced through annual round-ups. Horses removed are offered for rehoming first; surplus animals have historically faced slaughter. The Kaimanawa Heritage Horses Welfare Society, established in 2003, has saved more than 600 horses through coordinated rehoming efforts. In 2022, New Zealand added a contraceptive tool to its management framework: veterinarians now inject selected mares with a GnRH-based immunocontraceptive that suppresses fertility for up to four years, reducing population pressure without requiring removal. The program is monitored in partnership with advocacy groups, the SPCA, and the military (the herd lives partially on a military training area).
The New Zealand approach is distinguished by its institutional honesty: the Department of Conservation has been explicit that without natural predators, an unmanaged horse population will grow until it starves, and that managing population size is itself a welfare intervention. Genetic studies have also found that the Kaimanawa population is listed by the UN Food and Agriculture Organization as a herd of special genetic value — a consideration that shapes which mares are selected for contraception versus removal.
Mongolia is home to the world's largest population of genuinely wild horses — not feral, but the Przewalski's horse (Equus ferus przewalskii), known in Mongolian as the takhi, meaning "spirit" or "worthy of worship." The species was declared extinct in the wild in 1969, surviving only in European zoos from a captive population that at one point numbered fewer than 20 breeding individuals, all descended from 12 founders. The entire living population of approximately 2,000 Przewalski's horses alive today descends from that group.
Beginning in 1992, Mongolian and Dutch conservationists began reintroducing zoo-bred takhi to Hustai National Park. By 2000, 84 horses had been transported from Europe. The Hustai population now numbers over 350, with around 80 foals born annually. The world total of Przewalski's horses living wild across Mongolia, China, and Kazakhstan is approximately 800. The takhi's recovery is considered one of the major achievements of 20th-century conservation biology — a species brought from extinction at 12 breeding individuals to a self-sustaining wild population in roughly three decades.
The ecological logic behind the reintroduction is also directly relevant to American rangeland debates. Horses are native megafauna of the steppe — not ecological anomalies, but ecosystem engineers whose grazing cycles nutrients back to soil, reduces fire risk through vegetation management, and creates micro-habitats for ground-nesting birds and insects. Their disappearance from central Asian landscapes left a functional gap. The same argument is made, with varying degrees of scientific support, for the American mustang as a rewilded native species. The Mongolian case is the clearest available evidence that the claim has ecological substance.
Kazakhstan occupies a singular position in the global history of horses: it is the site of the earliest known evidence of horse domestication, approximately 5,000 years ago, and horses remain central to Kazakh identity — in its national sports, its cuisine, its language, and its sense of cultural continuity with a nomadic past. The Kazakh name for the Przewalski's horse, kertagy, had largely fallen out of common use, a small linguistic marker of how thoroughly the animal had been erased from the landscape by the mid-19th century through hunting and habitat pressure.
In 2024, the Kazakh government joined a multi-institution international partnership — including Prague Zoo, the Frankfurt Zoological Society, and the Association for the Conservation of Biodiversity of Kazakhstan — to begin reintroducing the kertagy to the Altyn Dala (Golden Steppe) nature reserve in the Kostanay region. Seven horses arrived via Czech Air Force aircraft in June 2024 for a year of acclimatization at the Alibi Reintroduction Centre before release. A second cohort arrived in June 2025; by June 2025, the first six kertagy were released into the wild. The program aims to reintroduce 40 to 45 horses by 2029, sufficient to establish a self-sustaining genetically diverse population.
The reintroduction is framed explicitly as both an ecological restoration and a matter of national identity. "We have a responsibility to restore every species that once lived in our nature," said Daniyar Turgambayev, Chairman of the Committee of Forestry and Wildlife. The kertagy will join the Saiga antelope and the Kulan (Asiatic wild ass) as the third member of the historic trio of native large herbivores of the steppe — a functional ecosystem that has been missing all three of its keystone grazers for generations.
| Dimension | Australia (Brumby) | New Zealand (Kaimanawa) | Mongolia (Takhi) | Kazakhstan (Kertagy) | United States (Mustang) |
|---|---|---|---|---|---|
| Population | ~400,000 nationally; ~14–22K in Kosciuszko | ~300 (managed cap) | ~350 at Hustai; ~800 wild globally | 6 released 2025; target 40–45 by 2029 | ~73,130 on-range; 64,205 in holding |
| Legal Status | Invasive species / pest (heritage protections repealed 2025) | Protected under NZ Conservation Act; actively managed | Endangered species; active protection | Endangered; active reintroduction program | Federally protected; sale/slaughter banned by statute |
| Primary Tool | Aerial culling; trapping and rehoming | Annual muster + immunocontraception | Zoo-to-wild reintroduction; GPS monitoring | International reintroduction partnership | Helicopter roundup; off-range holding; adoption |
| Lethal Control? | Yes — aerial shooting primary method since 2023 | Yes — surplus animals sent to slaughter | No — conservation program only | No — conservation program only | Prohibited by federal statute; de facto via Sale Authority loop |
| Fiscal model | State-funded; AUD $8.2M spent Oct 2023–Oct 2024 | DOC funding + NGO partnership for rehoming | International conservation funding; NGO-led | International partnership; Czech Air Force transport | $142M federal appropriation FY2025; 70%+ spent on holding |
| Cultural framing | Contested: "heritage" vs. invasive pest | Valued breed + ecological responsibility | National symbol; spiritual significance (takhi = "spirit") | Central to national identity; site of first domestication | Symbol of freedom and frontier heritage; also "eco-terrorist" |
| Key tension | Urban sentiment vs. alpine ecology | Scale of contraception program vs. population growth rate | Habitat and climate pressure on recovering population | Acclimatization mortality; small founding population | Statutory prohibition on most effective tools; politically captured management |
| Transferable lesson | Delay is not neutrality — it picks a side | Fertility control works at small scale; scaling is the hard problem | Horses have native ecological function; the science is real | Restoration is possible; culture can move in both directions | — |
A note on framing: These case studies are presented to inform, not to argue that any one country's approach is the correct model for the United States. Each operates under different legal structures, ecological contexts, and cultural pressures that do not translate directly. The American situation is in some respects uniquely constrained — no other country has codified such a strong prohibition on the most ecologically effective management tools while simultaneously mandating the protection of a population that is growing at 20% per year. That combination has no direct international precedent. The lessons from abroad are useful not as templates but as mirrors: they show what different tradeoffs look like when made consistently over time.