Something new has been happening at my home. All my fids are doing this now and I want to ask you if you think this is ok for them to do. My husband is a stone mason and in being one we have a lot of stonework in our home. My daycare kitchen area has a stone floor (rough slate) For the past two days all of the birds have been jumping off their cages/stands and going to the stone floor and rubbing their beaks all over it. They do this for a few minutes then go back to the cages/stands. Think this is ok? Or do you think they are going to damage their beaks?