Two ducks showed up at our house this summer. One is a large white (Pekin?), one is smaller and light brown. The brown one lays eggs in the water of our pond. I got some chicken feed and have been feeding them, and we have a large pond and 4 acres of grass for them to forage in. I don't know the first thing about ducks. What do I need to do for the winter? We live in the midwest and we have snow in the winter. Usually the pond freezes over late in winter if it stays really cold for a while. I'm assuming they'll need some kind of shelter from the cold. Please help!