I have 8 chickens that are 9 months old now. I have had issues in the past with feather pecking and bullying of one of my Easter eggers when some of the other chickens first started laying. I was able to put peepers on the two culprits for about 6 weeks. That was several months ago. Now I have my two barred rocks and two Easter eggers missing lots of feathers around their tails and vents. The two leghorns and the two buff Orpingtons do not have any missing feathers. I never witness the feather pecking now like I did in the past, so I am not sure who is doing it. They all are laying eggs daily or every other day and eating and drinking well. I am not sure what to do and how to get feathers back on those missing them. They do not free range as there are too many predators, but have enough space in the run. They eat organic feed. I give them some mealworms daily and boiled eggs once a week. I also give them lots of fresh greens. Any suggestions would be helpful.