Hi, This has probably been discussed ad nauseum, but does anyone have good ideas on providing dust and dirt to chickens who are not free-range? We have pine shavings in the house and run. No bare dirt anywhere. I put a plastic garbage can lid with sand and dirt in the house and sort of nestled it in the shavings. They avoided it like a bunch of "big chickens" for a day or two. I think they're using it now. It seems big enough. Any other container suggestions?