I have a plastic pond that I bought at Home Depot that I'm using for my call duck and wood duck pairs. It's about 60 gallons, and as the weather starts to get colder I wonder if the ducks are smart enough to not be in the pond all night and get frozen in, when the pond freezes over. Surely that wouldn't happen right? I mean wild ducks aren't freezing in ponds all over the country during the winter. Anybody have experience with this? Can't afford a de-ice thingy right now, so I'm just covering the board with plywood at nights. THanks!