I have had chickens for about 6 months now and my run is about 30' x 40' and 5' high. The "kids" that I have now have always stayed within this area and have never jumped the fence. I bought four hens from the feed store and after a quarantine time I have put them in with my others. Instead of the flock teaching them to stay within the run they are teaching the flock to jump the fence. I can probably extend the height of my run and wrap the extension with chicken wire but I really have no idea how high this should be. Hopefully with this and cutting the wings I will be able to keep the "wild women" and now the rest of the flock in the run. I have no way of putting a roof over everything as I have seen with the beautiful runs that I have seen here. Any advice would be much appreciated.