Our chickens are digging holes (I know that they are probably just for dust baths), but they are at the VERY EDGES of the run under the coop. Should I just leave them or fill them in?? Our edges have landscape timbers around the whole perimiter, but I don't think the wire got put down in the ground the way I wanted, you know like 4" deapth past the timbers. I trusted this to my hubby and 2 other 'men' so it was probably NOT done as specified. The chickens have plenty of holes in the middle the run under the coop, so why are they digging these??