I have six hens, three BO and three RIR. Sweet Pea, my smallest RIR (I call her the runt) has started terrorizing the largest RIR (Tinkerbell because she loves to fly), who is considerably larger. This started about two weeks ago and is getting worse every day. Sweet Pea won't let Tink near treats, she starts chasing Tink for no reason that I can see. Today she chased Tink all the way across the run, caught her, jumped on her back and started pecking at her head - I had to break them up. She won't let Tink onto the roost. If she is able to get onto the roost Sweet Pea manages to get next to her and pushes her off. I have to catch Tink and put her in the coop at night, she doesn't want to go in. I think Tink slept on the sand on the poop board last night. I am afraid Tink is going to be hurt. Recently I've noticed the other hens pecking at Tink and afraid they are learning from Sweet Pea. Their coop and run are more than enough space for six hens so they aren't overcrowded. I have all kinds of "toys" , swings, perches,swinging cabbage, CDs etc. to keep them entertained so don't think they are bored. It certainly isn't heat, it is freezing. I've read on other strings to isolate the offender for a week in a place where she isn't with the others. My problem is that I don't have a place to keep her isolated. I am wondering if it will it do any good to put her in a large wire dog crate inside the coop and keep her there day and night? She wouldn't be able to intermingle with the others but she would be in full view. I hope someone can give me advice. I don't want to rehome Sweet Pea, she is a cutie but this can't go on. Well, I'm off now to try to put everybody to bed for the night and stay there until, hopefully, everyone is settled down. Thank you!