I was wondering what size run I should have for 2 to 3 dozen birds? I am half way thru a 40x30 pen built with 6' chain link fence.Is that high enough for clipped wing chickens? Also is that enough square footage or if to much how many will that hold? I also plan to rotate them in and out of a tractor. Whats the opinion on using a 2' high band of chicken wire attached to the fence charger for a predatot deturrent on the out side of the run? I'm looking for added security when I'm at work and can't get to the old 10 Ga. and OO buckshot. Coyotes and coons are a problem here, we can't kill them fast enough.