I have 14 4 week old chicks that I would like to move outside so that I can move the 12 1week old chicks in to the bigger brooder. I need a idea of what size coop/run I would need for them outside. I have a coop/run but I have 15 older birds in there at this time that also get to free range. I do have woods behind me and I really don't want to go looking for the little ones. I have already had to do that. 1. how big should it be? 2 how long should that stay in there before I move then to big coop and free range? I was thinking of a tractor so that I could move then around the yard too.