I have 3 Cayuga ducks that are probably about 4 months old. they are currently living happily on my 1/2 acre pond which is in my sheep pasture. it is completely fenced but I still worry a little about predators. they have a dog igloo on the edge of the pond with some large rocks and tall grass for cover. I leave them out over night and so far so good. my question is, how will they do once the weather gets colder. we are in the Kankakee Illinois area a we will definitely get cold enough to freeze over. will the igloo be enough shelter? will they be able to get enough water? the pond is very deep (35 feet in the deepest part) so I know it won't freeze solid but how do ducks get water to drink in the wild during the winter.