Wildlife

Barn Owl Welfare and Secondary Rodenticide Poisoning

Barn owls are killed by secondary poisoning from anticoagulant rodenticides used in agriculture and buildings — welfare science shows the scale of the problem and the effectiveness of alternatives.

Key Facts

Around 75% of barn owls tested in UK studies contain detectable rodenticide residues
Secondary poisoning occurs when owls eat rodents that have consumed bait
Anticoagulant rodenticides cause death by internal haemorrhage over several days
The UK has guidelines restricting outdoor rodenticide use but compliance is low
Barn owl populations are declining in areas of high agricultural rodenticide use

Welfare Considerations

Secondary rodenticide poisoning causes prolonged internal bleeding and death. Affected owls are found disorientated, lethargic, and sometimes bleeding from orifices before death. Sub-lethal exposure impairs hunting and reproduction. The suffering is gradual and prolonged compared to many other mortality causes. Alternatives including trapping, proofing, and reduced chemical use can eliminate this welfare threat.

What You Can Do

Never use second-generation anticoagulant rodenticide products
Report rodenticide poisoning cases to the Campaign for Responsible Rodenticide Use
Erect barn owl nest boxes to provide safe nesting sites
Support Barn Owl Trust monitoring and conservation work