I have 11 hens. I don't have a rooster and have not had one for about 2 months. I cracked an egg today and there was a very obvious bullseye in both yolks (double yolker). I cracked another and yet another very obvious bullseye. I don't have a rooster. I don't get it. I do have one very aggressive sometimes roostery looking hen. I am assuming it is a hen anyway. It is about 5 months and does not crow and I think is laying plus she squats when I reach to pet her. Would a rooster squat? She is a tall chicken with a very prominent comb but her tail is not roostery at all. I can't find my camera but will look tomorrow and try to post pics cause I am confused. She is a production red.