We have twenty one hens (no roosters) and recently some have been pecked by others. We don't know which are doing the pecking. The chickens who are getting pecked have lost all their tail feathers and a large patch of feathers near the tail so we bought pinless chicken peepers to try to resolve the issue. As soon as we started releasing the peepers into one chicken's nostrils, she would jerk her head back as if it hurt. We had the same reaction three times on another when we attempted to insert the short pins into the nostrils. Where exactly are we supposed to put the peepers on the chicken's beak? Or do you have other suggestions to alleviate our feather-losing chicken problem?