I have a RIR Rooster that came with the 5 hens all as 2 day old chicks. He was great until he got close to a year old, then he started attacking. I have found 2 solutions: 1. Mr Rooster recognizes me by the cloths (colors) I wear. He's used to seeing me in either shorts, or jeans. If I wear a sun dress...he attacks. So, wear cloths (colors) he recognizes. 2. I put a dog harness on him (upside down) and put him on a leash! He doesn't like it, but it sure does calm him down for a good while. And, if I'm having someone he's unfamiliar with come to see my set up, he can't reach them! Now I don't have to kill him!