On Saturday I found a hen severely pecked in the back of the head. She is now recuperating in our basement in a kennel. Everything has been fine since then, but yesterday night I went out and found two more pecked hens. Not nearly as bad, only a tiny spot of missing feathers and one had a tiny bit of blood too. I sprayed them with blue kote and left them. This morning my husband just sent me a picture of one of my roo's all bloody. He has some pretty bad frostbite on his comb, but I think he needs to come inside too. Who would be doing this? We do have 2 roos, but I have been holding off on getting rid of one as they have not been aggressive towards each other and I want to see which one is the better roo. I have observed the flock as much as possible to see who might be the aggressive one but so far no luck (I work full time and go to school as well, so I only have a short time at night to observe). I did notice our barred rock rooster chasing and pecking at hens a bit when he couldnt catch them to mate them. Could this be causing the bald, sore spots on the back of their head? I just dont know what to do. I cant bring 5 chickens inside to heal. And I cant keep letting them all get bloodied up. Any suggestions? Please help! For reference, we have a flock of 15 that have been together since they arrived from the hatchery. 13 hens, 2 roos about 5.5 months old. They live in an old shed that is 10x12 feet and have access to .5 acres to free range on during the day (though its been very cold and snowy here in MI lately).