Wolf hunting in the United States has a marginal effect on reducing predation on livestock

A study published in *Science Advances* and conducted by the University of Michigan shows that wolf hunting, which is permitted in certain Rocky Mountain states, has a limited and highly variable effect on livestock attacks.  

A Reintroduction That Has Sparked Debate

Since their reintroduction into Yellowstone National Park and the Northern Rockies in the mid-1990s, wolves (Canis lupus ) have been at the center of a heated debate in the United States. Initially protected under the Endangered Species Act (ESA), the species’ status has been modified several times, shifting from federal protection to decentralized management by the states. In Idaho and Montana, recreational hunting has been permitted since federal protection was lifted. In contrast, in Oregon and Washington State, hunting remains prohibited, although authorities may order the targeted killing of wolves (lethal removals ) in the event of repeated attacks on livestock. This disparity has provided a unique research setting for measuring the actual impact of hunting on the coexistence of wolves and livestock.  

Measuring the Actual Impact of Hunting

A team led by Andrew Merz (University of Michigan) analyzed more than fifteen years of data (2005–2021) to answer a central question: Does wolf hunting significantly reduce livestock losses? The researchers used a comparative statistical model, contrasting states that allow hunting (Idaho, Montana) with those that prohibit it (Oregon, Washington). They also factored in official culling operations carried out in response to major attacks.  

A Measurable but Very Small Effect

The study shows that, on average, each wolf killed by a hunter reduces livestock losses by 0.07 head per year. This figure equates to a reduction of approximately 2% in annual predation per wolf killed. In other words, fourteen wolves must be killed to save a single head of livestock. Furthermore, the authors emphasize that this effect varies greatly from one area to another. While some ranchers may benefit from a slight reduction in attacks, others continue to suffer significant losses. The example of a rancher in Idaho, who lost 65 ewes in a single night, illustrates the limitations of a blanket approach to wolf hunting.  

No Impact on Official Culling

Contrary to what some hunting advocates claim, the study shows that hunting has no significant effect on the frequency of interventions prescribed by government agencies. In other words, recreational hunting does not prevent authorities from intervening when a pack of wolves repeatedly attacks livestock. The two measures remain independent and do not work in tandem.  

A Matter of Management and Perception

These findings add nuance to a deeply polarized debate. For livestock farmers, hunting is a regulatory measure that could limit losses in their herds. For wildlife advocates, however, it is ineffective and counterproductive, risking the destabilization of packs and an increase in attacks by dispersing the wolves. The study in *Science Advances* provides a clear answer: hunting has a real effect, but one that is very modest, limited, and uneven. It does not constitute an effective overall management strategy, but rather a marginal tool with limited benefits relative to societal expectations.  

Toward Integrated Management of Wolves and Livestock

The authors conclude that the future of wolf management must be based on a more nuanced and integrated approach. Recreational hunting alone is not enough to resolve conflicts between predators and livestock farmers. Other strategies, often nonlethal ones, could yield better results:

• enhanced herd protection (herding dogs, electric fences);
• increased monitoring during parturition seasons;
• more targeted compensation to offset losses;
• coexistence policies based on collaboration among livestock farmers, scientists, and wildlife managers.

 

A Debate Far from Over

By demonstrating that wolf hunting reduces livestock losses by only 2% per wolf killed, this study provides a well-supported argument in a debate dominated by ideological positions. Far from settling the controversy, it instead underscores the need to base management policies on scientific evidence, rather than on perceptions or political pressure.   As the authors point out, the coexistence of humans, livestock, and wild carnivores can rest on only one approach, which requires a combination of strategies tailored to local realities and integrating ecology, economics, and social acceptability.