We made a duck house out of extra cinder blocks and PVC roofing that we had so we have a good sized house for our 3 muscovies and 1 pekin. We're finishing the door up now but I'm wondering about the bedding or litter to use? The house is on a concrete slab that was already there. The ducks will only be in there at night (provided I can teach them to go in) and then they have our yard and pond to play in. Is hay good? Or should we use something else? For a nesting box I was going to put a plastic tub in with holes cut out unless I find a better option-but what's a good bedding for the nesting box?