We have a run that is the earth, some sand, some rocks some leaves. We had a little truck bed cap that I wanted to keep in there so that they would have a place to get out of the weather and hang out if they wanted to. They have decided to turn that into a super huge communal dust bath. They all go in there, bury themselves in broken down leaf matter and dirt, roll around, kick it on each other and just plain old hang out in there. The first time I saw one of our new Leghorns come out I thought she had been "rolled" by one of the other chickens. She was a mess. They Love It!