My muscovies did great all winter! They have down coats!
They need protection from the wind- and they like to roost on things- I used hay bales for them to roost on in various places in the yard- and I built them a lean-to shelter that they could be out of the wind, and that is all they needed...
It has been my experience that two hens per drake is not enough. My drakes fought and fought and fought over the four girls. I ended up rehoming one of them. However, the first year they were fine. It was into their second year that the fighting began. I think it is an individual duck thing-...