Dumpling is 7 to 8 weeks old. She is the only one of six girls who has this problem. The other five have beautiful feathers, but poor Dumpy is losing them on her back. I've been watching closely, and I have never seen any of the others picking on her. I have not seen her preening more than any of the others either, and I don't think she's pulling her feathers out. Here's what I've done so far............ 1) Dusted them all with food grade DE yesterday, and dusted the pine shavings in their bedding. 2) For the past 2 weeks I've been giving them scrambled eggs and cooked hamburger to add more protein to their chick food - hand feeding to them as they will be pets 3) I give them corn cobs, cabbage, etc because it's so entertaining for them and for us, too! 3) They are outside all day in their tractor until their run is finished, and I move the tractor twice a day so they will have shade and fresh grass 4) Free range in my back yard for about 2 hours each night while we are outside with them. Do you think one of the others might be doing this to her when I don't see it happening? Could she be doing it to herself? Could it be some kind of disease? I checked for mites or lice, but I don't see anything. She's a black Jersey Giant, and it does look like she has dandruff, but I can't find any bugs. I did buy some Permethrin, but haven't used it yet, as I hated to use it on all 6 chicks if it's not a bug problem. I'm hoping that this picture might help someone tell me what's wrong. Thank you!