My 3 week old Buff Orpington chicks are eating chunks of paper towels. Perhaps I need to change their bedding to something else or maybe it's not a problem. Their brooder is a large rabbit cage that has a heavy duty plastic floor (with small holes) that fits inside the bottom tray. I've been lining the floor with paper towels, then putting pine shavings on top of it. As they've gotten older, the chicks are scratching through the pine shavings and making a mess of the whole thing, finding and shredding the paper towels. I've seen all of them gobble down chunks of it. They are eating lots of their chick starter food every day and a daily treat, so I don't think they are overly hungry. Any ideas?