My d'Uccle/Ameraucana rooster is just a year old. He's always been wonderful with my hens and I've never seen any aggression from him. He steers clear of people; has never flogged, postured or challenged me. He's beautiful, docile, and sweet with his girls. My five pigeons even live in the coop, and he's great with them. He's a good rooster. There's just one problem (well, aside from the excessive crowing!) he will NOT leave my Polish hen, Penny, alone! Penny is about two, she is one of my original girls and was head hen before Knucklehead the rooster grew up and took over. I have seen Knucklehead mate with the other hens, but whenever he tries with Penny, she squawks and runs off. Now he's taken to chasing her around relentlessly, and she's TERRIFIED. Today she jumped up to my shoulder from the ground to get away from him. She spends a lot of time hiding from him in one of the nest boxes with her face in the back corner. Now, I haven't seen any blood or wounds, or really any aggressive contact. He just chases her like a madman, he'll jump on her back, there's a lot of squawking as she freaks out and runs away and into the coop. He'll generally leave her alone once she's in the coop, but the very second she comes back out, it's game on. Why is he doing this all of the sudden? He doesn't do it with anybody else. I was thinking it's because she's the only hen who won't allow him to mate her, but I could be totally off base. How do I stop this? I love my rooster and don't want to rehome him, so I'd like to try some alternatives before going that route. However, I don't want Penny to live her entire life terrified and stressed, so if it comes down to rehoming him, I will. Should I separate Knucklehead from the flock for a while or let them work it out as long as there aren't any injuries?