Two questions here: First, I'm a building a run but am also thinking about letting them free range. I assume I need to clip a wing so they can't fly over our fence. How high can a chicken with a clipped wing fly? (You do only clip one wing right?) Which leads me into my second: If they can't fly, do I need to rethink my coop in terms of roost and nest box heights? Can they still get to a nest box about 18 inches off the ground? I can build little ladder things for them if necessary. Thanks!