Our bourbon red hen gets along fine with all the chicken hens, roos and peahen we house her together with even though some are bantams. She is weary of new birds, but never aggressive towards any properly introduced bird once it's part of the motley flock. She is the peace-keeper, the coop police as we call her. Since we raised her by hand she follows us everywhere and loves people. It's almost annoying at times but it's far better than an aggressive bird.