My bantam Cochin, really doesn't mind other chickens. But she absolutely hates our only RIR mix. She pulls out feathers, gives her scars. And sadly, our RIR mix, Bonnie won't stand up for it. This isn't pecking order. When we first got Bonnie in December, Luna picked her. Bonnie came in due to other issues from end of January to beginning of March. Luna still hates her! If I have to, Bonnie would stay and Luna (Cochin) can go. I like them both, but Bonnie likes me the most. Luna, pecking Bonnie after sparring with her.