My rooster is about one year old and he is recently acting aggressive. The weird part is, he is only aggressive toward humans. With predators it also seems like he isn't doing his job, we have lost many hens. I will simply be outside giving them treats or just collecting eggs and he will sneak up behind me and start attacking. His neck feathers raise and he jumps up to attack. Is this normal rooster behavior? I try not to turn my back but the minute I do he charges after me. He has also showed this behavior toward other people too.