We have an older coop that we refurbished 2 years ago. It serves our chickens well, but we are constantly fighting a battle against rats. We have 5 barn cats who do help, but they can't get them all. The floor of the coop is metal, but the sides (and most everything else) is wood. The coop is elevated on cinder blocks (high enough so that the cats can get underneath) The rats have chewed through all sorts of things to get into the coop. I've tried using steel wool in the holes they chewed, then covering it with sheet metal and then fastening it down with a 2X4 on top. Is this the best I can do? Will this be a never-ending battle no matter what I do? Any tips/tricks and suggestions are welcome. Its SOOOO frustrating to go into the coop to finish the chores only to find rats scurrying! ARGH!