The answer is stark: federal officials estimate that saving the northern spotted owl from extinction will require the lethal removal of up to 450,000 barred owls over the next 30 years. This ambitious and intensely controversial strategy represents one of the largest planned lethal control efforts for a bird of prey in the world
The Scale of the Cull
The U.S. Fish and Wildlife Service (FWS) finalised its barred owl management strategy in 2024, selecting a plan that could authorise the removal of approximately 15,000 barred owls annually across a maximum of about 23,000 square miles in California, Oregon, and Washington. The goal is to reduce the population of the larger, more aggressive barred owls, which are considered an invasive competitor that has expanded its range westward into the spotted owl’s territory.
Why the Barred Owl is Targeted
- Competitive Advantage: Barred owls are larger, more aggressive, more adaptable, and have a higher reproductive rate than spotted owls.
- Displacement: They displace spotted owls, disrupt their nesting, and compete with them for food.
- Population Pressure: With an estimated 100,000 barred owls now living within the spotted owl’s range, which contains only about 7,100 spotted owls, the competitive pressure is immense.
A recent successful experiment in California, in which researchers removed 3,373 barred owls, demonstrated that this strategy can stabilise spotted owl populations. In areas where barred owls were removed, spotted owl occurrence and reproduction stabilised, while they continued to decline in untreated control areas.
The Controversy and Cost
Despite the promising results, the plan is highly controversial and faces significant opposition from animal welfare groups, some lawmakers, and scientists.
Arguments Against the Plan:
- Ineffective and Costly: Critics argue that the plan is “impractical and grossly expensive.” A group of 19 lawmakers estimated the cost could exceed $1.3 billion, or roughly $3,000 per owl.
- Ethical Concerns: Animal welfare groups argue that “we cannot victimise animals for adapting to human perturbations of the environment.” Some scientists also question the ethics of killing one native species to save another, especially when the habitat loss that initially endangered the spotted owl remains unaddressed.
- A Never-Ending Problem: Critics point out that the killing would have to continue indefinitely, as barred owls will naturally recolonise areas from which they have been removed. They argue it’s like “keeping spotted owls on life support” rather than a permanent solution.
- Despite the data, the plan is not without its critics, who raise several points:
- The Ethics of Killing:
- Many animal welfare and conservation groups oppose the plan on principle, arguing that it is inhumane to kill one charismatic species to save another and that humans are simply “victimising animals for adapting to human perturbations of the environment.”
- Cost and Scalability:
- Critics argue the plan is “impractical and grossly expensive,” with estimates ranging from $3,000 per owl to a potential total cost of $1.35 billion over 30 years.
- A Perpetual Problem:
- Wildlife biologist Dr Eric Forsman noted that control would have to be maintained “forever”, as barred owl populations would recover as soon as management stops. “Ultimately, we’re going to have to let the two species work it out,” he stated.
- The decision to implement the plan is seen by its supporters as a difficult but necessary choice—a “heartbreaking killing” that will “buy spotted owls the time they need”. This stark example of active human intervention shows how we manage ecosystems that human activity has already profoundly altered.
A Question of Values and Science
The debate over how much killing is “enough” ultimately hinges on a profound ethical question: is it justifiable to intentionally kill hundreds of thousands of animals to save a species from extinction? As one researcher who participated in the culling experiment noted, “Every time I went out there to do it, it was extremely difficult.”
While the science suggests that lethal control is an effective, if temporary, tool, the long-term solution likely requires a dual approach: managing the invasive population while simultaneously restoring the old-growth forest habitat that is essential for the spotted owl’s survival.
Spotted owls are at a critical point, and we need to manage both barred owls and habitat to save them. This issue isn’t about choosing one owl over the other. If we act now, future generations will be able to see both owls in our Western forests.” — Kessina Lee, FWS Oregon Office state supervisor
The plan to save the spotted owl is a dramatic and emotionally charged act of conservation intervention, reflecting the difficult choices humans must sometimes make to mitigate the unintended consequences of our actions on the natural world.
