I have 4 chicks and one is a white crested black polish. The others are a silkie and 2 BO. I haven't noticed any problems to date. They are about 3-4 weeks old now and starting to feather out. I noticed that my polish started looking a little bald on top so I set up a camera to see if she is being pecked. Nothing in 48 hours of video. I'm attaching a pic of her the day I got them and then one from today. I have no idea what could be causing this. Help!