My broody muscovy duck's eggs didnt develop and I wanted her to have babies, so I put the duckings in her nest when she went to get food. She came back and was astonished, it was amazing to watch. Her neck was very long and she kept looking around her house. eventually she approached then, then stood near them, then sat near then, then moved a little nearer, until eventually they were under her. Im very happy it worked! The babies are Rouen/Campbell mix, there are three.