I am introducing four new hens to my existing flock of seven hens and one rooster. I am wondering if it is normal for my rooster to be fairly aggressive to the new hens? I have always heard that the rooster in the flock will just step aside or even protect the new hens but my rooster is the main aggressor. He hasn't hurt anyone but he will chase the new hens and peck at them. Is this normal dominance behavior or is he an overly aggressive rooster?? Thanks