I have a wooden coop house in an open run area. The coop hen house sits on a concrete base. The coop is raised a few cm off the concrete floor on small legs. I lock the chooks in the coop house at night and let them out in the morning. Their run is open air, half concrete half soil with trees and bushes one side, fencing at the back, greenhouse at the the other side and netting at the front. I have stopped throwing chicken feed in the run since learning about rats. They do however have straw on the concrete part of the run. If I remove their food tray when I lock them up at night so there's no food will I likely be safe from a rat problem? I want to do all I can to prevent rats. Will the coop be safe at night or will they chew their way in to get to the chooks? Not sure how 'secure' things need to be but building an enclosed run isn't something we can do. I was thinking though that might be better as less shelter for them up seek. Any advice welcome. Thanks!