I found a male Muscovy wondering around our neighborhood. I could tell he had been attacked - no tail feathers, one wing was damaged and he seemed very disorientated. I put him in with my chickens and he did well until he became an adult and very amorous. We had to kick him out, but we found a couple of females to keep him company. They are still young and I wasn't sure how to take care of them - what type of environment, and what about nesting. Your article answered a lot of my questions.
I am still wondering about their nesting places. Mine seem to like anywhere but the nesting box my husband built - it is quite open - three sides and a roof. I find them sitting against the house and digging in the dirt to make a nesting place.
Should I just spread some straw around where they generally sleep and forget about the nesting house? We live in Hawaii, so there is no need for shelter from the snow. I don't think they mind the rain when we get it - we are entering our dry season now. We provided a small pool for them, which they love to take advantage of. They sleep on the ground, for now, do they need something to roost on - up off the ground?