You can get ducks to stay in your chicken coop. To do this, build a pond in your pasture in Chapter 2. With the sickle, cut an X pattern leading to the pond. That night go to sleep late where you will wake up after your wife. She will wake you and say there is ducks in the pond. In order for this to work, you must have room in your chicken coop. One drawback is your chickens will start laying duck eggs.