My chicks are one week old now and some of them are pecking there own feathers out on there belly leaving there belly bare. I have watched them do it to them selfs. They r in a 50 gallon tote for there brooder. So they have a lot of room. I change out the pine shavings out every 3 to 4 days. Why are they pecking there bellies? What can I do to stop them? Is it normal for them to do this? Or am I just freaking out because I care to much about them? Lol this is my first time raising chicks of any animal besides a dog.