Wildlife

Barn Owl Conservation and Rodenticide Secondary Poisoning

Barn owls are effective natural rodent controllers increasingly affected by secondary rodenticide poisoning that compromises their health and reproduction.

Key Facts

A barn owl pair and their offspring consume approximately 3,000 rodents per year
Second-generation anticoagulant rodenticides bioaccumulate in barn owl livers causing hemorrhage
Studies find rodenticide residues in over 90% of barn owls tested in UK and Europe
Sub-lethal rodenticide exposure impairs barn owl breeding and immune function before causing death
Providing nest boxes and unimproved grassland habitat supports barn owl populations effectively

Welfare Considerations

Secondary rodenticide poisoning causes internal hemorrhaging that may take days to cause death, representing prolonged suffering in individual barn owls. Sub-lethal exposure impairs health without causing obvious mortality, making the population-wide impact larger than death counts alone suggest. Supporting natural rodent control by barn owls and other predators eliminates the need for rodenticides in many settings.

What You Can Do

Switch from second-generation to first-generation anticoagulant rodenticides or non-chemical pest control
Install barn owl nest boxes in agricultural areas to support natural rodent control
Report barn owl carcasses to wildlife monitoring programs for rodenticide testing
Advocate for stronger restrictions on second-generation anticoagulant rodenticide availability
Learn about barn owl ecology to appreciate their value as natural pest controllers