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I thought that the poison thinned their blood to the point where they internally bleed to death. I would think that the cats would need to eat a fair bit of rat to kill themselves as it is second hand and probably diluted by the time they are dead. Only guessing tho.We have cats on our site and a fair few rats as well - so they aren't doing a very good job - but having said that I think that they are all pet cats - so probably too well fed!Old Bird