I have 8 hens & they have been out in their coop/run for just under 1 yr. They get to free range rarely, especially now that the hawks are back in the area to raise their young. Anyways, they are digging like there is no tomorrow! They have space under the coop so they can get out of the sun & they just love to spend the day under there. They have dug all under the boards that make up the frame of the run & they are under the skirt of the apron that makes up the run fencing. What can I do to stop them??? If I put soil under the coop, I just see them digging it all back out, same for mulch. Any suggestions to stop them from digging to China???