Two nights ago, just before dark, I discovered a big pile of loose dirt on the back side of the duck cage. Just next to the cage was a hole that led under and into the floor of the pen. Obviously, the chicken wire lining I had installed did not stop this critter. What worried me the most was the way the ducks acted. They did not want to go in. Even though supper (including Cheerios treats) awaited them in their small shelter, the web-footed birds avoided it like the duck-plague. Something had been in their home and terrorized them.