Our coop/run is 6'x16'. The run is 6'x16' and the coop(has run space under it) is 5'x6' (we originally built it for 10-12 hens). I will let them out in the run year round. I also have a tractor that is 5'x8' that I let a few out in the yard during the day. I would love to free range and do only when we are right outside with them, but I have already lost 2 to foxes. So my question (due to chicken math) is how many hens should I have?