I have 100ft roll of 4 ft high of garden 2 x 4 mash, steel posts . Trying to decide the best safety. They would only be out during the day. Should I keep it narrow, so I can put a netting on top or a breath able tarp, or just open. I need suggestions before I get started. We do mow the pasture several times a week and could just give them clippings. Probably do that any way too. Our pasture was made for Mules but it will be modify`d for ducks.