Does not Fly: All wild waterfowl fly. It is just nature. In order to keep them in an open topped pen you will have to get Pinioned birds or feather clip them each year after they molt, which happens twice per year.
Hawks will not bother in an open topped pen: The hawks will bother any flightless bird in a large pen that is not covered. Keeping some sort of cover, such as a coop, house, or some bushes may help by giving them a place to hide when the hawks do come, but there is always a risk with hawks and uncovered pens.
Friendly: Wild Waterfowl are not friendly in the same respect as domestic waterfowl. They will often be flighty and panic when you enter their pen. Some may come up to your feet or just not be bothered by you, but most will not. Mandarins and Wood ducks tend to be fairly calm int hat respect, but are not cuddly by any regard.
Broods Often: Wood ducks and Mandarins are good brooders. A raised nest box is best and the box should be large and enclosed.
