Agreed - but add this - if you're using galvanized bins, leave the feed in the original bags. Galvanized steel has toxins that can leach into the feed ... and into your chickens. On the plus side ... leaving feed in the bags means you can also store a bag of scratch or a supplement in the same bin ... double duty!You may have to dig a trench around the shed and run and bury hardware cloth to keep them out. Rats dig deep tunnels so go 2 ft deep. If you don't use galvanized garbage cans with secured lids to prevent rodents from eating any pet food you put out or garbage you will never get rid of them.