This is our second winter with our 7 Khaki campbells. Last winter they did fantaticly. They loved the snow and the cold didn't bother them. This winter only 2 of the 7 have molted. The 5 other poor ducks have feathers that are bare and faded. They just sit around shivering. Any idea why the 5 haven't replaced their summer feathers? Would it be dangerous if they did molt at this point? Single digit days below 0 at night. Thanks in advance.