A little bit of background about the specifics of my situation... I have eight various breed chickens living in an Eglu Cube with an extended run. They all have access to our large, fenced in yard at all times. I have checked them all, and found no evidence of mites or fleas. I've cleaned out the Eglu (part of the appeal of the Eglu was the plastic housing that's less likely to harbor parasites) and haven't seen any indication of problems. And absolutely no eggs! The last couple eggs our chickens laid were late October. No eggs hidden around the yard, and no chickens hanging out in the nest box. Our chickens look terrible! Most of the feathers they've lost came from their heads, their necks and their stomachs. And if they all decided to molt, why now? The high temperatures are in the low 40's, and the lows get to the mid 20's. We don't have enough chicken sweaters for all of them! Any advice/ideas are greatly appreciated.