I have some spots (holes) in the run area that the hens have scratch out and was gonna try to fill them in, well guess what? A wheel barrel load of woods dirt is the next best thing to "sliced bread" to chickens. I dumped 3 wheel barrel loads of woods dirt in the run area and they when wild, they were scratching and pecking. I'm sure there were bugs and who knows what else in there. I didn't even spread it out, they did it for me and enjoyed every minute.