RE: Cool looking duck
The duck that Swampthing is holding is most likely is a really old hen mallard, or a hermaphrodite. My dad is a waterfowl biologist and has shot one of those before. When a hen mallard get's old, like in human, they stop producing as much female harmones and will take on male characteristics. You can tell by the bill that it is a hen mallard. The patch of green and the small curls are indications of male characteristics. It could also be, like stated above, a hermaphrodite where it has both male and female sex organs and will produce both characteristics of male and female sexes. Still, very unusual.
The firstmallard looks like a drake that doesn't have full plumage yet. If it were part Widgeon, there would be more characteristics of a wideon such as a blue bill or a white belly.
There was an interesting artical in the last DU magazine about cross breeds.