Hello all. I hope this is the right place to post this, but I'm not sure if it's a disease or if she is getting picked on by the other girls. I have 6 girls, age 6+ months. All of them have started laying eggs in the last month. This one in particular is a RIR. Today I noticed that all of the feathers along the front of her throat are missing. They aren't in a position that she could have picked them out herself b/c she can't reach there. My first thoughts say another chicken(s) is pecking at her, but I haven't seen any of this behavior in an exaggerated way. They all poke at each other from time to time. But I worry that there is some sort of disease/pest involved and I need to know what to look for. If she is getting picked on by other birds, how can I stop this? Will I need to confine her away from the other girls? They were all raised together since 2 days old, and there have never been any new additions. Any help anyone could suggest as to how to get to the bottom of this mystery would be greatly appreciated!