Hi all! I have about 20 or so chickens (Australorps, Barnevelders, Isa Reds and one lovely Wyandotte) and I'm noticing that about six of them that were all hatched out in the same batch are plucking their lower back feathers out and eating them (I'm assuming). We have one large Australorp rooster but he doesn't seem too rough on them and the other hens I have are fully feathered! The skin isn't bleeding, red or looking irritated, it just looks.. Well, plucked! Does anyone have any ideas? I've tried swapping their food to a higher protein mix and it doesn't seemed to have helped?