We don't have a clue what's happening! Rhode Island last week, perfectly healthy one day found dead in the coop the next. And today the same with a Barred Rock. Our hens are about 2yrs old, have organic pellets and fresh well water supply, inside coop and nesting boxes, and a large outside open aviary with dirt. I dusted the flock (15 hens) for mites about 2 weeks ago b/c our rooster had a severe case of mites. The other hens did not have any or very little evidence of mite eggs. The vet said she suspected liver disease in our rooster b/c of his flaky beak and fatigue. he seems to be doing better. One other symptom is that about half the hens have had prolonged molting period with bare spots on their backs, necks, or tails... Do we have some sort of virus in the flock? What can we do to determine the cause of death? Thanks.