I have 29 chickens unsexed about 4 months old. Seems like I have 70% roosters(lots of crowing). There are some chickens in the flock that have feathers missing from their backs. Like they've been plucked out . Is that normal behaviour like the pecking order? Or could it possibly be something else? They are in a 10x10 coop with a 5x5 run (in the process of making a movable run as well) and will be killing all roosters eventually.