Angie, there is a possibility that the poisons could be taken and ingested by other wildlife. You can buy traps that are specifically built to hold rat poison and exclude most other wildlife - but are unable to exclude mice, voles and shrews etc. Accurate placing of the trap is the best way to ensure it gets the Rat - worth looking for the runs it has and placing on them. Do not place it right at the tunnel entrance - the rat will just use a different exit.

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Rat

British by birth
Scottish by the Grace of God

Blog updated Wednesday November 13th