My 7 chicks have dig HUGE holes in the run. They started out just stratching for worms but turned into bowling ball size holes. Any recommendations on how I can get them to stop or to direct them to dig in a certain spot? They have access to a grassy area that they can dig in all day long. In the run, they are starting to dig under the fencing. I've tried putting logs in the and over the holes but then they just dig around the logs. Nutty little buggers! Thank you!