From an August duck posting -- not to worry about our ducky guys. They are hardy to -15 deg C, which is 5 deg F.
http://www.feathersite.com/Poultry/Ducks/Musc/BRKScobies.html
This site tells us Muscovies are the only domestic ducks that are not derived from Mallard stock. They are a South American species. They are intelligent and the males(drakes) will be much larger than the females (ducks). This site tells me they are "tree birds" so they don't need water! They are also great mothers and expert foragers, which I think we would all agree with now. They are even hardy at -15 deg C which is way below freezing.
