Rodenticides and Wildlife: Secondary Poisoning and Welfare Impacts

Anticoagulant rodenticides kill target rodents slowly and accumulate in the food chain, poisoning raptors, foxes, and other predators. Safer alternatives are available and increasingly mandated.

Key Facts

Second-generation anticoagulant rodenticides (SGARs) are found in over 75% of barn owls, red kites, and buzzards tested in the UK
SGARs cause death by internal haemorrhage over 4-7 days in target rodents — and the same prolonged death in predators
Brodifacoum and difenacoum persist in rodent bodies for weeks, exposing multiple predators through secondary poisoning
Barn owls are particularly vulnerable as specialist rodent hunters with high exposure to poisoned prey
Integrated pest management (IPM) combining trapping, exclusion, and habitat modification reduces reliance on rodenticides

Welfare Considerations

Rodenticides create a cascade of wildlife welfare failures. The target rodents die slowly from internal bleeding over several days — a prolonged and painful death. The poisoned carcasses then kill barn owls, buzzards, red kites, foxes, and other predators that consume them, causing the same agonising death in non-target species. SGARs are now found ubiquitously in UK birds of prey, representing population-level welfare harm. Safer alternatives — snap traps for rodents, physical exclusion, and IPM approaches — achieve effective rodent control with far lower wildlife welfare costs. Consumer and professional pressure toward non-rodenticide pest management drives the transition away from these harmful compounds.

What You Can Do

Avoid using anticoagulant rodenticides at home — choose snap traps and physical exclusion as first-line methods
Support wildlife organisations monitoring and campaigning against SGAR use in agriculture and urban settings
If you use pest control services, ask about their rodenticide policy and request non-toxic alternatives
Advocate for legislative restrictions on SGARs and mandatory registration of professional rodenticide applications