I have a dozen RIR hens. One of them has out of no where started picking at her own toes to the piont of significant bleeding. She stopped for a few days but then started right up again. She also seems to not be as social as she once was. I thought it was maybe because i had them cooped up for a few days during a cold spell, but now they are free range again and no change. I do give them some scratch grains to keep them occupied when the ground isnt bare. I have been reading about this problem with chicks but havent found anything on older birds. Any help would be appreciated.