So for a week, I have a 3 year old hen who has been sitting in the run and does not move fast and sits so much it collects urine/ammonia in chunks on its rear. I found another hen, same age, suddenly dead today in the coop. No signs of illness or trauma. Her coat was beautiful and seemed healthy. I am dealing with rats around the coop. I don't think they are living there, but they like the run. I am catching quite a few of them, but I think there are some left. Are the eggs safe to eat? Any thoughts as to how to keep our flock safe?