I'm a first time chick mommy. I have 3 RIR and 3 NHR... I think. They are all red and from TSC. Anyway, they are 4 weeks old and are in a big box with corrugated cardboard around the inside to avoid corners. Now they are pecking wholes in the cardboard! Is there something I can do to get them to stop? I tried biting duck tape over the whole but they just pick at it. Any ideas?