Warfarin is the poison most people think we use against rats and mice. We have now moved past warfarin as mice and rats have a resistance to it. Now we use second generation poisons such as difenacoum and bromadiolone. Even these poisons have got some resistant populations and an alternate baiting strategy is needed.
Warfarin is still used but only for indoor squirrel baiting. The bait in the picture shows small takes for squirrels. Often when squirrels find this type of bait in a roof space it will end up scattered fairly widely about. Smaller neater takes tend to indicate single animals.
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