We are getting ready to move to the country on five acres. (Yippee!!!) That means more chickens! Anyway, we are surrounded by cornfields on three sides and a cow pasture on the other. We're planning on letting the chickens run a bit, but I don't want them damaging the neighbor's corn. I'm assuming we'll need to keep them penned in the spring until the corn is in? How high would you think the corn will need to be before they'll leave it alone and their scratching won't damage it?