My chickies will be 7 weeks on Monday. Currently in a coop with an attached fully enclosed small run, which is inside a 12' x 40' fenced area (not fenced on top). My worry is having the little gals fly over the 4' fencing. They seem to have no trouble trying out their wings in the enclosed pen, so I am concerned about letting them range in the larger area. Should I wait until they are larger (and heavier) or will they learn to be content in their fenced area? I have 4 SLW and 3 BO's.