If they were horses, I'd call it cribbing... except they're just chewing, not sucking air. All three of my girls seem to have gotten into the habit of pecking at the siding on the house where their run is, as well as the fencing. They are doing a rather substantial amount of damage - enough that I'm starting to worry about installing some sort of outdoor "wainscoting" all around the run. Are they bored? Are they lacking something important in their diet? They have just about 10 sq ft per hen in the run, and daily excursions into the larger yard in the afternoons. There are no plants or anything in the run, because they have destroyed them all. They have a constant source of water and organic layer feed, and I give them scratch and/or oatmeal and/or a couple of mealworms and/or garden bugs every day. Is there anything I can do to either treat the wood so they stop "chewing" it, or distract/entertain them so they stop eating the house? Any advice is much appreciated!