I'm going to have a large run for them, as well as a tractor so they can free range, but be protected from the monsters that lurk in the woods around the house. How quickly do chickens destroy a yard if you don't move the tractor often enough? Will they rip the grass up in one day or one week? I'm planning on 8-10 hens and the tractor will be 6*10 probably. Haven't fully designed it yet so it may be larger. The run is 6x12 at the moment but may become 6x24 if I get more dog kennel panels.