Hi all, as winter sneaks up, I'm looking at ideas for my ducks. They have access to a 1/3 acre pond and it will have some open water most of the winter. In their pen, I have a small kiddie pool they dunk in and drink from. Has anyone used one of the outdoor heated floor pads for dogs/kennels under one of the pools? (Are they weather proof enough?) My biggest interest is keeping drinking water defrosted, but the ducks in the past have emptied chicken waterers quickly -- by spashing. Any ideas or tips?