Wild Barn Owl Decline and Rodenticide Threat

Barn owl populations are declining in many regions due to rodenticide poisoning, loss of rough grassland habitat, and road mortality.

Key Facts

Barn owls (Tyto alba) are found on every continent except Antarctica and most oceanic islands
UK barn owl populations have declined by over 70% since the 1930s due to habitat and prey loss
Second-generation anticoagulant rodenticides (SGARs) are detected in approximately 80-90% of barn owls tested
SGARs cause internal hemorrhage and can accumulate to lethal levels through eating poisoned rodents
Barn owls hunt exclusively by hearing, detecting voles through dead vegetation with remarkable precision
Nest box programs have successfully supplemented natural nesting sites where old buildings have been modernized
Road mortality from hunting along road verges kills approximately 3,000-5,000 barn owls annually in the UK

Welfare Considerations

SGAR poisoning causes progressive internal hemorrhage - a prolonged, debilitating death. Barn owls with sublethal exposure show impaired flight and hunting ability before death, a welfare harm without obvious external signs. Road mortality causes acute trauma. Habitat loss reduces prey availability causing food stress and starvation particularly during cold winters. Nest box provision, SGAR alternatives for rodent control, and roadside habitat management all directly improve barn owl welfare.

What You Can Do

Install barn owl nest boxes in suitable habitat following species-specific guidance
Avoid using second-generation anticoagulant rodenticides - use snap traps or first-generation products instead
Support organizations like the Barn Owl Trust monitoring populations and providing nest boxes
Maintain rough grassland habitat with long grass supporting vole populations near your property
Report barn owl road casualties to monitoring programs to track mortality hotspots
Advocate for SGAR restrictions and farmer guidance on wildlife-safe rodent control