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Hmmm... Other predators then, like rat terriers, or imported non-poisonous snakes. King Snakes aren't poisonous, and primarily feed on rats. If they keep the rat numbers down, they'll help keep poisonous snakes away too. The rats will bring the locals to the feast, if you can't reduce their numbers.

You're a waste of space. You've been flagged like the trash you are.