I have what I suspect is an opossum digging and getting into the runs to eat the chicken feed. It must not be very large because the holes are only about 4 inches deep. Whatever it has not touched my birds. Any ideas on what this creature is? I started putting out scraps outside of the runs to deter it which has helped - it is loving the leftovers! I plan on extending the chicken wire into the ground around 12" like suggested but haven't had the chance for the last 2 weeks.