I have 18 chickens and they eat alot of feed, I've been thinking of freeranging them to reduce costs but I'm worried they might jump my fence, my fence is about three feet high and it surrounds about half an acre. I have pretty rich neighbors so having my chickens eat some of their 100 dollar petunias would be a no-no. Would half an acre be enough land that they wouldn't be tempted to jump the fence? Or should I buy some netting to raise the fence 2 more feet?