I have three hens and a rooster. Two of the hens are a year and half and the other hen and roo are 7 months old. He was unintentional. Up until yesterday/today they have all pretty much gotten along with the 2 older hens being dominant. Yesterday the roo challenged the older hen and chased her around the run but didn't hurt her. I thought it was him making his place in the flock. This morning there was a squabble where I broke it up because I was worried he was going to hurt one of my hens (she had her head through the coop and he was trying to mount her and it was violent looking). Then everything was fine for several hours. Just now I heard even louder squabbling and I ran outside to find him chasing her around before he pinned her in the corner of the coop. The guy who is building our deck said it looked like he was trying to kill her. I was worried because her comb was pale and she was freaking out. I whacked him off of her and picked her up and took her in the house to clean her up. He'd ripped out feathers on the back of her head and bloodied her comb to the point it looked like she has a bloody nose. Is this normal teenage rooster making himself dominant or are these signs of an aggressive rooster? He has never come after a human/dog/cat etc. He mates the younger hen but has never mated an older one. Though he has tried in the past they have always chased him off. I would appreciate people not just telling me to put him in freezer camp or make soup out of him - I'm a vegetarian and he is a pet. But if he's going to hurt my hens and this is out of the ordinary, I'm willing to get rid of him.