My chicken coop is attached to my barn. They go in there only to lay, eat, and roost. I lock them up at night, but during the day they are free to come and go, roaming wherever they want. Lately, some have opted to roost in the barn and slowly, each of the others followed suit. Now all 21 of them roost all over the barn instead of the coop. Too much of a mess for me to want to endure. Why do you think they did this and what can I do to get them to start roosting in the coop again? This evening I caught every one of them and put them back in there myself.