These mallard hybrid pictures were taken at Scargo Lake in Dennis (on Cape Cod) during our vacation this past August. We were vacationing with our friends Dave and Meg, and I asked Dave what kind he thought they were since he's a hunter, wildlife biologist, and general expert on the subject of birds- especially ducks. He said they looked like a hybrid- probably mallard hybrid and domestic duck.
It's funny because these ducks just wouldn't learn- they kept coming in dangerously close to our rental house's dock, only to be chased off by Dave and Meg's dog Foster, who's a trained hunting dog. He had a lot of fun doing it each time though, so no harm no fowl :)
Just look at this precious boy- such a cutie!