I do not have a great update - we are still having the same problem. We had one bait house, just added another today. I am going to have to completely clear all brush, everything from the side of the house, drop pellets in any hole I find, then cover the holes. I keep patching where they are getting in the coop/run and they keep creating new entries. As soon as it is dry enough (it rained this morning and supposed to almost every day this week) we will dig a trench and then pour cement all around the coop/run. We have always had a sand run, to control odor and easily rake out, but now it is just a sea of mud in there - maybe pine shavings, but we aren't certain if this will be better or worse as far as the rats go. So frustrating. Also, they do not seem to have any interest in the plasteraparis (sp?) we put out. Why would they... my coop is their buffet!! I'll keep updating and checking other threads. Thanks everyone for the helpful advice.