Barn Owls and Rodenticide Poisoning

Barn owls are secondary victims of rodenticide use, accumulating lethal doses of rat poison through their prey. Understanding this threat is essential for protecting these iconic predators.

Key Facts

Barn owls can consume 4-8 rodents per night, rapidly accumulating rodenticide residues
Studies show over 90% of barn owls tested in the UK carry rodenticide contamination
Second-generation anticoagulants like brodifacoum persist in liver tissue for weeks
Rodenticide poisoning causes internal bleeding, weakness, and disorientation in raptors
A single contaminated rodent can deliver a sub-lethal dose that still impairs owl function

Welfare Considerations

Rodenticide poisoning represents one of the most pervasive and insidious welfare threats to barn owls and other raptors. Unlike direct persecution, it operates invisibly — poisoned owls may die slowly over days, experiencing internal hemorrhaging and weakness before death. Sub-lethal doses impair hunting ability, night vision, and flight coordination, causing prolonged suffering and starvation. Because barn owls are apex predators that concentrate toxins from entire food chains, even modest rodenticide use across a landscape can affect owl populations significantly.

What You Can Do

Use snap traps or electronic rodent control instead of rodenticides
Support campaigns to restrict second-generation anticoagulant rodenticides
Install barn owl nest boxes to support populations in your area
Report sick or dead raptors to local wildlife rehabilitation centers
Advocate for integrated pest management approaches on farms