I have a flock of eight chickens and five muscovy ducks. One of my chickens has frozen to death, and that had me concerned about the rest of my flock. I went out and found my muscovy drake partially sitting in the snow as if for some reason he was to weak to use one of his legs. Usually when I approach him he moves away rather quickly. Today though when I tried to get close to him he had a lot of trouble moving. Even flapping his wings he could not move very fast. He seemed like he was weak and tired. The ducks have a coop to get out of the wind and off the snow, and the chickens have an elevated coop that they can fly into at night. They do not have heated shelters. Any suggestions? I really don't want to lose any more of my flock, especially if it is because I should be doing something and am not.