Hello, This is my first flock of chickens and they're all a couple weeks apart but were all raised together and are about 3 months old now. I have them out in a coop with an extension. I have a dust bath, grass clippings w/ treats in the them to scratch through, and a couple perches for them to sit on. So I feel like I have things to keep them busy, But i just noticed recently that two of my hens and my Bantam Roo (that I'm looking to rehome) have been "challenging" the other (Hens vs Roo). The hens are heavy breeds (Plymoth Rock and E.E.) and my Roo is a Bantam (unsure of breed since he was picked from an assorted breed group at the local feed store). I saw the Roo, as what it looked like to me, bite the EE (Edna) neck and I heard her scream and he eventually let go. And then I saw my Plymoth Rock (Agnes) and Roo standing up to each other like they were squaring off and since the Roo is a Bantam he's like half her height. She had her mouth half open and making noises every now and then. She eventually charged but the Roo stood as tall as he could and jumped on/over her then they were done. Then shortly after that, I saw Edna run at him and hold her wings out a bit then put them down, with her mouth half open making noises as well and the Roo did the same thing. Stand tall and jumped on her. I feel like they are becoming annoying with him? or maybe establishing a pecking order? I have 6 total, 4 heavy and 2 bantams (including the Roo) Any help or advice is greatly appreciated. TIA!