Ok, first of all Hi! I'm a long time lurker first time poster. Second: I have searched the forums and could not find a post that really covered my circumstances. Sorry up front if I am doing this wrong. Also Sorry this is so long. I wanted to be detailed and accurate. Let me share the details. Last night my 9 week old Easter Egger Rooster viciously attacked 5 of my pullets(also 9 weeks old). I mean chased the first one and ripped out feathers. The second one he chased and attempted to mount. The third and fourth he repeated the attempted mounting. The fifth and final he chased and chased terrifying all of the other hens. He finally cornered her and got her down as I was running to get in there(I would have been there sooner but I was in the field feeding the calves and horses). Once he got her down he savaged her. Ripped out feathers until she was bleeding and she was just laying on her side. He was still doing it when I was getting in there. I got in there and booted him and chased him into the coop. I bent down to grab him and he jumped up and spurred at my face but I ducked and he got the bill of my hat. I went after him again and grabbed him when he came up to spur me and he was still fighting and trying to peck after that. I shook the hell out of him(I also had a hold of him long enough that he calmed down because I had to carry him around while I located the pet taxi) and chucked him in a large pet carrier and he is still there with food and water of course. I have doctored the hens and they are doing well and seem calmer without him in there. The situation: They are all the same age and from the same NPIP certified hatchery. I ordered 15 Pullets and 1 Rooster(I figured the odds were that I would end up with another Roo too.) They have a 16x4 coop with a 25x75 run with plenty of grass and bugs. There is also a net covering the top for protection. They eat a high protein(20%) starter grower ration until they start laying. They also get some kitchen scraps that they really enjoy like tomatoes, yogurt, cheese, kale, and spinach. They are healthy, have no mites, or other problems. He really just freaked out. My question: Will he grow out of this? Maybe when they are a little older and more ready submit to mounting behaviors? I know I don't need a Rooster for eggs but would like to have a flock protector(I prefer to lose a Roo not one of my hens to a predator). I don't really care if he's aggressive towards me. I'm not afraid of him at all(I handle cows, bulls, start horses, and do manners for people with problem stallions for a living)In fact this leads me to believe that he will better protect his flock. We have foxes, neighbors have stupid free range dogs, there are possums, hawks and owls that are all around this place. I will not however tolerate the attacking my girls. If this is something he has a chance to grow out of or maybe he wants more mature pullets I can keep him separate and wait. If this won't change I will move him to the freezer.