I have 10 hens now and one rooster. Recently I've noticed him picking on a few of the girls. He'll come up behind them and peck at their tail end and then walk away. We like having a rooster because we try and let them roam the yard as much as possible (and hopefully hatch our own eggs one day), but if he's going to be like this he'll either have to be re-homed or become dinner. Any suggestions? Anyone else ever have this problem?