I look at my birds each day but when I got home I noticed this male Quail with feathers missing on his back and when I picked him up feathers were falling out. He also felt different then the other birds. I tried looking for bugs or parasites and didn't see any. He was in a pen with 10 hens and one other male for a few months with no problems. Any ideas right now I have him separated, could they have just turned on him. I haven't seen any chasing or anything like that. When he pooped after being put in the new cage it looked normal. He has always had access to a dust bath. Thank you for your help