Yesterday I bought 24 three week old assorted coturnix. Many, if not most have bare areas behind their necks and down their backs. Is this part of the feathering out process, have they been fighting, or might they have mites or something? They seem healthy enough, and since I housed them in a larger facility I haven't seen any fighting. I gave them a shallow pan with sand and some DE, and they are enjoying it. Do I need to worry about the 9 one week olds I incubated that are in a brooder just a foot away?