Today I noticed my RIR, Freda fighting with the other hens. Then the other hens started pecking her. I removed her and she was still acting crazy. She's standing real tall, wings slightly spread and chest out. Like she was ready to fight. I let her free range by herself for about an hour. I let her back in with the others and watched as she once again stuck out her chest and was starting a fight with the others again. The one big change is that I rehomed our rooster a week ago. Freda was his favorite. Poor thing because totally bald and bared backed because of him. Everything looked normal and they all got along just fine. In fact they looked relieved that they no longer needed to watched their back for that rooster! Maybe this behavior is related? Buy why NOW?