i just found my 12 week old hen dead. I could not see a positive cause of death. she had a broken wing and few tiny blood spots on her head and face. we got a good amount of snow today so i checked for tracks. Only tracks i found around her were our rabbits tracks. I have noticed the rabbit biting at our chickens feathers before, didn't think much of it just figured the chickens would let the rabbit have it if it bugged them. Or could it be a hawk or owl and i just couldn't see the tracks. when i found her she was still very warm. Also we did introduce a new hen with the seven we already had. She is the same age and breed, B.O. and they've been together for a week. dont know if it was her. thanks for your help!