I currently have eleven hens, seven in one coop and four in a smaller coop. I'm thinking it might be good to introduce a rooster to keep the seven "big girls" busy, and to help protect the flock when they're out free ranging. Can I introduce a strange rooster? How should I do it? What should I look for in a rooster (age/size, etc.)? If I let the chickens all free range, will the rooster be mean to my four "little girls" from the other coop? (Two refuse to leave the coop so far, my little Easter Eggers.) Thanks!