I have a small back yard flock of mixed breeds of chickens and about a week ago a very healthy, 9 month old Barred Rock hen just hunkered down, quit eating, and then died. Now I have am Americauna hen who is doing it. They are all done molting, in perfect feather, big and strong.....then they just quit on me. I don't see signs of worms, I use DE generously in the coop when I clean it, I feed quality organic feed as well as a block treat that is covered and dry. Speaking of dry, it has been a total mud mess in the chicken run becuase in WA here we have had nothing but wet, wet, wet and more wet weather. So, what else can I do? What else should I look for? No labored breathing. No nasal discharge, some yucky poo but I don't think it's anything really horrendous. I checked the Poo Chart and no red flags there. Sometimes I see a poop that is NEON green but I have no way of knowing who's poo that it is. Any help guys? Suggestions? Thanks!