I'm having trouble with a couple of my girls. Two of my Australorps are losing tail feathers. I have sixteen chickens, 10 issa browns and six australorps. Besides the two that are losing tail feathers, seven or eight of the others are losing feathers on the butt. I haven't seen anything about this, and I am having a hard time getting pictures, but here are some pictures of the australorps. Any help would be appreciated.