They aren't that common. In fact, they are considered critically endangered, with only 188 recorded breeding ducks. They were encouraging breeding programs etc last year. Thats one of the reasons we decided to start breeding these awesome birds.
Mine "free range" in a half acre fenced area, and Ive got them in a routine, I come out and they all run in. We accomplished this by feeding them only at night, in their night pens. We had to herd them in for the first week, but then they caught on quickly, as its easy as pie! They are ready...