So we have 10 wonderful hens that we adore! However, two of them are Rhode Island Reds and they dig all the day long. We have them in a run that is 10 X 16 with and elevated house and plenty of roosting area, and let them out for 2-3 hours everyday to roam our fenced in backyard yard that is about 3/4 acre. But the Rhodies make a mess wherever they go!! I swear they are trying to tunnel out of here! Any tips on curbing some of the digging? We are constantly filling in some of their tunnels and are sort of frustrated. Thanks in advance!!