Well, I have almost 100% stoped the little bird from getting into the coop and run! We used bird netting and ziptied it to the wire. I found the netting at my co-op but it is online also. We had to make sure there were no gaps and put boards around the bottom so they could not sneek under it. I have only had two little buggers sneak in after this was put up!! It was under $50 to do, would be a little more if we had not already had the boards we put abound the bottom. Hope this helps someone, good luck.