I have two coop a 4x8 and a 9x6 both have runs around them and both runs can run into each other or separated by opening a door. both runs are 6 feet tall and have chicken wire for the tops. the runs are 15x27 and 15x22. that give me 84 sq ' in coops and 735 sq ' in run space I also free range all day every day. The question is how many birds can I keep with out over crowning. will it be save is some roost in the runs scene they are enclosed? Can someone help.