I have a BTW Japanese rooster who WAS fine with the rest of my younger birds and other bantams. This weekend I moved some of the younger birds into the new warm coop and he came with them. Suddenly he is bullying everyone, not picking on them to hurt them but chasing them until they have to lie down they are so tired, then he pecks them a few times and walks away to chase someone else. I am sick of him doing this to the girls, he even picks on the standard size hens and Silkies. I am REALLY tempted to put in my aggresive-to-other-roos rooster in the pen with them and let him teach the Jap rooster a lesson.