Okay, we have predators, foxes mainly... or only.... anyway, my ducks and goose are sleeping in a completely secure wire pen, with straw and grass clippings over the bottom layer, so their feet never touch wire. but winter is coming! and i am going to need to do something different then. (vermont) I have 2 mallards, 2 Kcs, 1 blue swede, 1 pekin and one chinese goose. I am thinking about building a foundation of hay bales, and then putting my husbands dented truck cap on top.... then fencing around the outside, vertically and across the bottom, secured with zip ties or something so I can undo it in the spring, and all the ick will just be sitting there. how big do you think I need? They'll be able to run around in the day, but at night i need a minimum sq. ft... they really like eachother, and have occasionally stayed in small quarters, but i want them to be extra happy in the winter.. what do you think?