I have six chicks about five weeks old and at least three of them have scrapes above their beaks. They don't look bad, just small abrasions. The only thing I can think of is that they keep trying to peck at the grass just outside their run and are scraping their beaks on the hardware cloth. Should I try to clean the scrapes or just leave them be? Also, any ideas how I can get them to stop doing this to themselves?