Secondary Poisoning of Wild Mammals

How agricultural and urban rodent control poisons enter food chains and cause suffering in foxes, badgers, otters, and raptors.

Key Facts

Foxes, badgers, polecats, and stoats are commonly exposed to rodenticide through prey
Second-generation anticoagulant rodenticides accumulate in predator tissue over multiple meals
Clinical signs of anticoagulant poisoning include lethargy, pale gums, and internal bleeding
Post-mortem testing of red kites, barn owls, and foxes routinely finds rodenticide residues
Legal use of rodenticides on farms accounts for more wildlife exposure than illegal poisoning

Welfare Considerations

Secondary rodenticide poisoning causes a protracted and painful death through internal bleeding. Affected animals become progressively lethargic, lose coordination, and die over days as anticoagulant effects accumulate. Many die unobserved in burrows or vegetation. The scale of exposure is significant - surveys show majority of tested raptors and predatory mammals carry rodenticide burdens even without evidence of direct poisoning. Where sublethal exposure occurs, immune and reproductive effects may further compromise wildlife welfare. The solution requires both individual product restrictions and system-wide reduction in rodenticide reliance.

What You Can Do

Use integrated pest management approaches that minimize rodenticide use
Choose first-generation products with lower secondary poisoning risk if rodenticides are needed
Dispose of dead rodents promptly to prevent scavenging by wildlife
Support campaigns to restrict second-generation rodenticide availability
Report suspected poisoning of wildlife to police and wildlife authorities