I've noticed something with my girls lately. Sometimes after walking around and pecking at the wheat/corn I put out in the afternoon, they'll all go over and stand in this one part of their "yard" and just start digging in their feathers with their beaks very much like a dog does if it has fleas. After they do that for a little bit, then they go on about their business, walking around, scratching, sitting to rest, etc. I checked a few of them for lice/mites but I didn't see anything. Do they do this even if they don't have lice?