This male Shoveler has been around for about 3 weeks now and he definitely has a thing for female Mallards. I'm not sure if it is the same Mallard he has the hots for but he is sure trying to impress.
The Mandarin duck and the Mallard I took picture of earlier have produced a duckling, so these two would probably also be able to. I have never seen a Shoveler before. Life is interesting