Wild Barn Owl Rodenticide Secondary Poisoning

Second-generation anticoagulant rodenticides accumulate in barn owls through their prey, causing internal bleeding and death in one of agriculture's most important natural pest controllers.

Key Facts

Barn owls in the UK show 80-90% prevalence of rodenticide residues in blood and liver samples
Second-generation anticoagulant rodenticides (SGARs) persist in prey animals and bioaccumulate in predators
SGARs cause fatal internal hemorrhaging in owls exposed to sublethal doses through their prey
Barn owls eat approximately 1,000 voles, mice, and rats per year per breeding pair
A barn owl pair and their owlets can consume more rodents than any chemical rodenticide program
Legal restrictions on SGARs for agricultural use have been implemented in some jurisdictions
The Campaign for Responsible Rodenticide Use promotes stewardship reducing wildlife exposure
Providing barn owl nest boxes supports populations that would otherwise control rodents naturally

Welfare Considerations

Internal hemorrhage from rodenticide poisoning causes a slow, painful death over days as blood pressure drops and organs fail. Barn owls may become lethargic and unable to hunt for days before dying. The irony is profound - rodenticides are killing the very predators that are the most effective and sustainable rodent control. A farming system that prioritizes barn owl habitat and nest provision over chemical rodenticide use achieves better long-term pest control while eliminating a significant wildlife welfare harm.

What You Can Do

Install barn owl nest boxes on agricultural and rural properties
Use rodenticides only as a last resort and choose first-generation alternatives where possible
Support Campaign for Responsible Rodenticide Use stewardship principles
Advocate for stricter regulations on second-generation rodenticide use near wildlife habitat
Report sick owls to your national wildlife disease surveillance program