Hubby and I have had chickens for a few years now. We had always let them free range, which the neighbors were all okay with. But today we got a note from the Humane Society saying that we need to contain our birds. We have a nice coop and run, but if they're going to be in there full-time, I'd like them to have more space. I was wondering how much room 5 birds need in order to maintain the grass cover. I don't want just a dirt yard; I'd prefer for them to have the benefits of free-ranging, just in a smaller area. We have half an acre of property, but don't want to fence the whole thing!