Wild Barn Owl Welfare and Rodenticide Exposure

Barn owls are secondary victims of rodenticide use in agriculture and rodent control, accumulating lethal and sublethal doses of anticoagulants through their prey.

Key Facts

Studies in the UK find second-generation anticoagulant rodenticide (SGAR) residues in over 80% of barn owls tested
Sublethal SGAR exposure causes internal hemorrhage that may not be immediately fatal but compromises survival
Barn owl populations have declined significantly across Europe and North America since the mid-20th century
Barn owls consume large quantities of rodents and are particularly vulnerable to bioaccumulation of rodenticide residues
Several SGAR compounds are now restricted in the EU due to wildlife impacts, but enforcement is variable

Welfare Considerations

Barn owl rodenticide exposure represents secondary poisoning on a large scale. Owls consuming rodents that have ingested anticoagulant baits accumulate the compounds in their liver, ultimately suffering internal bleeding that can be immediately fatal or cause sublethal debilitation that reduces hunting performance and survival. The welfare impact is diffuse and largely invisible — owls found dead or in decline rarely have obvious cause of death without laboratory analysis. Transitioning rodent control to snap traps, live capture, and physical exclusion in agricultural buildings eliminates this exposure pathway while maintaining effective rodent management.

What You Can Do

Avoid second-generation anticoagulant rodenticides — use snap traps or physical exclusion as first-line rodent control
Contact your local council about the rodenticide products used in public space rodent control
Support restrictions on SGARs in agricultural settings where barn owl populations are present
Install barn owl nest boxes on farmland to support owl populations as natural rodent control agents