I have a small problem. I have six chickens, three WL and three BA. They have free range to my 1/2 acre, fenced-in back yard. They are all 16 weeks old and have been let out at sun up and put up at sun set. Just recently two WL have been perching in my Crape Myrtel. I have had to pull them from the tree and place them in the coop. The coop provides four square feet of living space per bird. They each have 10 inches of perch space. They typically bunch up at one side of the perch versus using the entire perch. Im at a loss as to what to do. Is this normal or odd? Is there a way to curtail this behavior? Any advice would be greatly appreciated.