We have had rats in the barn, and near the chicken coop. Rats are difficult/impossible to trap; you will get a few, but never the whole group. I locked up my chickens, the barn cat, and the dogs, and set out dicon rat bait, for about a week. Lots got eaten; when no more disappeared, I picked it up and waited a few more days before letting the cat, birds, and dogs out again. Never say a rat carcass, but no more live sitings or rat poo. Ugh! Mary