I'm very concerned. I have around 50 hens and keep a clean nice size coop. My hens are farm raised and have all the great grass and bugs to eat. I have never encounterd this problem in 5 years. 2 hens dying in one week. The first hen that I noticed was in the morning soon after I let them out of the barn. Labored breathing and weak. I tried to give her water I also turned her upside down in my arms to see if I could get her to react. Within an hour her head tremored and she died that quickly. I examined my flock and they seem to be fine no respitory , or skin problems . Some of their droppings are very dark but do not have an odor. /today I noticed a 1 year easter egger laying on its side dead. It's body was totally stiff neck and legs. One eye was open, the other closed. I dont know what is wrong. I'm wondering if they are eating any poison that possibly someone maybe threw on my grass I dont know just very concerned over this matter . Remember 50 hens that's alot to be concerned about.