My RIR hen Pearl is a fatty and also a bully. She wasn't always like this but over the past few months she has really begun to beat up on my EE hen Valentine. At first it was just pecking here and there and it has evolved into chasing my Valentine away from BOTH feeding dishes, Pearl won't allow Valentine to go into the coop to roost for the night until Pearl is either asleep, too lazy to peck her/chase her out, or I have to sit in front of the coop entrance to sort of intimidate Pearl and allow for Valentine to get up on the to part of the roost as far away from both Pearl and my RIR rooster, Juicy. During the day Valentine sits in the coop all day because I think the stress of Pearl is too much. When I come home for lunch or after work and let them out Valentine is almost always inside the coop, the other two are out in the run. So she doesn't really eat or drink during the day it seems - she usually drinks a lot once she gets out of the coop when I get home. Once Juicy had mounted Valentine and during their "time together" Pearl came up and viciously pecked Valentine right in the face/head. And finally, earlier this week, I picked up Valentine and noticed she had a few feathers missing and I lifted up her wing and holy crap she is missing a bunch of her feathers and her skin is clearly irritated from pecks (see photos), feathers being ripped out... ugh it made me so sad and upset. It looks painful and now as the feathers grow in I think its even more sensitive. I've been cleaning the area and rotating with antibiotic ointment and some salves to hopefully relieve the skin and help it heal quicker. I'm not sure what to do about Pearl. I only have 3 chickens and they were raised together by me since little hatchlings so it isn't like they don't know each other. Valentine used to actually be, not necessarily more dominant but she was more "queen bee" than Pearl. But now the tables are completely turned. Valentine free ranges by herself now usually. She is underweight, docile, and now naked under her wing. I want to keep her separated but we don't have the space for another run or coop... we thought about splitting the run in half so she could be "safe" from Pearl but I'm worried that when they range together Pearl will be more aggressive maybe? I've read that we need to remove Pearl and keep her separated for several days, maybe even weeks! But I live in a fourplex apartment and have limited space - I don't really have anywhere I can put her. We've been having a lot of tapeworm problems, which I suspect is part of Valentine's weight issue. So we've wormed them and I make sure that Valentine gets her share of food before putting her in the coop with the others - I'm hoping she will beef up and maybe be able to take care of herself in there but she's just so docile. Any suggestions? I love all my chickens, but Valentine is clearly my favorite. I'm worried about her. I don't want to get rid of Pearl either... not sure what to do to help the situation. Would building a new run with separated areas work? I think most of the beating up happens during the week days when I'm at work and they are all cooped up together for several hours. Maybe they're really bored... I try not to give too many treats (partly because Pearl is a fat fat and eats ALL of everything, definitely won't share with Valentine) but maybe I need to provide something else in the run? They have a large perch in the coop and the run, a mirror, and sometimes I hang lettuce or something by a string. They free range for a hour or so every morning and evening and are out most of the day during weekends. Anything else I can provide for daily entertainment when they aren't free ranging?