About a week ago we lost one of my hens none of them have been sick but it was raining really bad and we found her early one morning on her back in the run. Well we have another hen who was her best friend. They never left each others side always together they were inseparable. After that one died the other started acting weird. Almost like it was depressed and a few days later we found her dead one evening. Can they die from grief or depression or could have been something else?