I want to raise my call ducks in pens, but not the raised ones with wire floors. does anyone know how much room they need in a floor pen? Holdereads books of ducks says ducks need 6-8 sq feet per bird, but I am thinking that is big ducks since the book isn't really about bantams. I want a pen for 3-6 ducks how big? I know that they need a run for daytime in the summer.