i have an area 30 feet x 30 feet for my 12 chickens to free range when i am around. I presently have it enclosed with snow fencing. Only to keep the chickens in..there is no netting on the top. I am going to put a new fence up as it is quite ugly looking so i will buy actual chicken fencing. Question how high should it be inorder to keep them in.i leave the run door open so they can run in if spooked or feel threatened.i was up on the roof of the coop yesterday and one flew up beside me which is 7 feet high. My current fence is 4 feet high and they do not seem to want to venture over the top, i hope it will never try to fly up again if no one is up there.