I have 4 buff orps, 2 black australorps all 10 months old. A BO went broody here 4 months ago and hatched out 6 eggs. I found her dead tonight in the coop when closing up. She was still warm and it looked like she fell off the roost. I gave her a good inspection and found nothing out of the ordinary. Good skin color, no mites, not egg bound and no fighting. I opened her up and found nothing unusual. If I would have butchered her for eating we would have cooked and ate her. The only thing I noticed is that the comb and wattles where pale. I only have 1 hen laying now that winter has set in. She was free ranging as usual today with no ill signs. I am now worried about the rest of them. What in the heck could have happened. She was eating and drinking as good as the others. I spend a lot of time with them and noticed no strange behavior.