I'm really new to raising chickens. My four ladies are about 3 months old and have been living outside in their coop for about a month and a half now. I have a fenced back yard, but I'm leary about letting them run around outside of their own fenced in coop. Would it be better to fence in a small area for them to graze in or just let them run around the back yard? Would they go back to their coop in the evening? Has anyone experienced chickens getting into the trees and "flying the coop" over the fence or finding areas where a fence may have a small opening and crawl under?