One of my coworkers has a large pond/small lake on her property, complete with what she thinks is an old duck house on a small island in the middle of it. She asked if I could hatch out a few ducks for her. Neither of us knows anything about ducks, so here I am for some info. She wants birds that are pretty self-sufficient, though she walks along the pond every evening and would like to feed them and visit, etc. Any suggestions?