Wild Barn Owl Welfare and Rodenticide Exposure

Barn owls are widely beloved but face a hidden welfare threat from secondary rodenticide poisoning. Understanding how to break this cycle protects both owls and farm rodent management.

Key Facts

Barn owl populations have declined by approximately 70% since the 1930s in the UK
Secondary poisoning from anticoagulant rodenticides (SGARs) is found in the majority of tested barn owls
Rodenticides affect coagulation - poisoned owls die slowly from internal bleeding
First-generation rodenticides (warfarin, diphacinone) are less persistent than SGARs
Barn owls each consume 4-6 mice or voles per night - a single poisoned rodent can transfer lethal dose
The Campaign for Responsible Rodenticide Use (CRRU) promotes better practice to protect wildlife
Nest box schemes have helped stabilise barn owl populations alongside farmland habitat management

Welfare Considerations

Secondary rodenticide poisoning causes one of the most prolonged and painful deaths in wildlife. An anticoagulant-poisoned barn owl may survive days or weeks as its ability to clot blood progressively fails - experiencing internal haemorrhage, weakness and ultimately collapse. The owl gives no visible external sign of poisoning until it is near death, making intervention impossible in the wild. Rodenticide use reform - switching to less persistent first-generation products, using bait stations correctly, and never applying bait in the open - directly prevents this suffering without compromising rodent control efficacy.

What You Can Do

Never use second-generation anticoagulant rodenticides (brodifacoum, bromadiolone) outdoors
If using rodenticides, use tamper-proof bait stations and never leave bait exposed
Install barn owl nest boxes on farmland to support populations outside poisoning risk areas
Support the Campaign for Responsible Rodenticide Use guidelines
Report dead or dying barn owls to the Barn Owl Trust for toxicology analysis