I've been reading up a bit on bullying in flocks, but I have to find a situation that quite matches my experience. I started my flock about a year ago with 6 chicks (3 RIR, 3 ISA Browns) and inherited 5 further chickens (2 Americaunas, 1 Orpington, 1 RIR, 1 Dominique) about 4 months later right after I moved my young hens out to their coop. The flocks initially maintained a shared but mostly parallel experience. I have a fairly large run (~800 sq. ft) and for months the two flocks shared the coop, food, and water but mostly had two distinct corners of the run that they would hang out it separately, both shaded by grape vines. I even put some makeshift roosts in these areas to give them something better than the ground to sit on. The only exception was one poor americauna from the new flock that my young chickens collectively harassed. For a long time this was just quick pecks when she was isolated but she was safe when she stuck with her flock. Over time, though, the two flocks became fully integrated and the bullied hen was spending more and more time by herself on the opposite end of whatever side of the run the rest of the chickens were hanging out. This was fine until the last few weeks when my young hens have, as a group, taken to increasing going out of their way to attack her. Even when they free-range with several acres to roam, they will sometimes pounce on her and peck her repeatedly until I break them up and then still come at her while she’s hiding behind me. The bullied chicken is incredibly docile and rather than run she now just hunkers down and puts her wings out in a submissive stance while they the crowd around her and one jumps on her back to peck. What’s worse is the hens from her original flock, while not bullying her, are no longer sheltering her and occasionally will drive her off too. Up until this recent escalation I have not noticed any physical harm done to the bullied chicken and even still there has been no blood or injuries that have resulted from this, but they have started to pull out her feathers a bit. I am not interested in rehoming the 5 (I lost one to hawk last week) young chickens that are bullying her since they seem to get along just fine with the other chickens from the inherited flock, but I am wonder if, in this case, it might be a good idea to try and rehome the bullied chicken. Other tidbits: 1) The bullied chicken is older than the chickens bullying her. 2) The inherited flock are all older than my young chickens and, with the exception of this americauna, seem to have a higher position in the pecking order than the young chickens. 3) When winter came and the vegetation died, the chickens seemed to be more agitated even in their large run and have spent more time grouped together under the roofed subrun where the coop and the food/water are. I wonder if spring and summer will give a wider range to feel safe in their run, reduce competition for space, and relax the bullying. Thoughts?