I live in an apt complex with a pond. For as long as anyone can remember there has been a father and son Mallard pair. Well, one day, the dad was gone. No one knows if he died, moved on, was attacked by an animal, etc...
I was walking Aspen when I saw an old man with a cardboard box looking out at the pond. Then I saw her, a young Muscovy female following the poor Mallard all over the place. He, at that time, wanted nothing to do with this strange looking thing. The old man felt sorry for the young Mallard and bought her for $10 from some guy. He didn't know realize they were 2 different species, he just thought they would get along. I thought that was one of the most thoughtful things anyone has done. He seemed so pleased that she took to him right away.
She is now a pretty, mature adult and they are the best of friends, he actually follows her around now.