I want to allow my chix to roam around the backyard and have limited free range, but I also have 2 full grown (several years old) male Guineas that roam the backyard. Chickens are 5 weeks old I have let the chix out into a run attached to the coop and the main Guinea has rushed the fence trying to peck the babies. When and how should I introduce the big outdoors to the chix and how do I protect them from the Guineas? Thanks!!