I have three ducks and don't know what to house them in for winter. So far this year (we got them in March) they have been in a large dog kennel. I am in northern Utah and we had some pretty cold days in the winter. I am most worried about cold nights. Also, how do you keep the pond (kiddie pool) from freezing. If I am to build something for them, I want to get started before the snow starts falling.