So now that my chickens are 5 weeks old, they are in a large yard area and are loving it. Dust bathing, chasing bugs, scratching, eating, looking for grit, napping etc there is one chicken in particular that grooms herself more than others. She is sort of fixated with doing this, even one day she started grooming herself like this in the middle of feeding her egg yolk which she's crazy about and I find grooming herself despite the goodies being offered to her, abnormal. She's also the same chicken that pulls other chick's feathers and eats them causing several chicks to bleed. She hasn't done the pulling feathers behavior as before now that she is in the yard, just the occasional pecking when in the coop when he goes in, but almost all the time she is in the yard, I catch her grooming herself. I wonder if she is trying to pull out her own feathers or if she is eating her dry flakes of skin. Last time she was on my lap she left several flakes of dry skin or white plumage (she is black, by the way)? Anyhow, all chicks are on the same feed: organic chick starter with up to 18 percent protein and they are all in the large fenced area. With boredom and overcrowding out of the equation now, why would she be still showing this behavior? and why is she the only one with this problem? Do chickens like dogs develop food allergies or problems absorbing protein or something like that?