I'm not quite sure what to do about my ducks when winter rolls around. We live in Michigan, so it gets pretty cold. Our pond freezes over, and we go ice-skating on it-cold. I already have plans on ordering diapers for my ducks when they get full grown, and they already come inside for an hour or so every day, so I was thinking, maybe keep them indoors during the winter? (They're pets) Dad suggested that we put a regular light bulb in their house, would that work as well? And during the winter, when the pond is frozen over, should I still somehow get them swim time?