What do you put in your duck pens? I put straw in mine but it seems to get wet and dirty really fast. right? lol Anyway I raked the straw out and laid some slate rocks down that I had laying around, then I put fresh straw on top. I didn't have enough rocks to cover the whole floor but it's at least under where their food and water is. I then put their water up an some pavers and hung their food dish from the side of the pen. This morning when I let them out it looked wet all around by their water dish. So, what do you do to keep things dry?