My flock of six hens have been eating each other and their own feathers. Some of the hens have bare patches on their backs, but it is not from molting. I tried spraying the area with hot picks, but it has literally no effect. a hen turned around and plucked a feather out of her back and ate it with no adverse reaction even though it was wet with hot pick! They are eating layer pellets and get a little scratch and lots of greens. What could be wrong? They are not overcrowded. Could they be protein deficient? Is there a way to cure this behavior? I looked into pinless peepers, but it seems kinda mean? Thanks for any advice, especially if you successfully solved this problem in your own flock.