The "Can" is probably the most sought-after duck for hunters (but I know I have described Mallards and Black Ducks similarly). Not only is his 60 mph flight a challenge, but he is considered the most tasty duck at the table. He is probably tasty because, despite being a diving duck, he prefers plant material. He's fairly large, too.
He breeds in the West and Northwest up through Alaska, but winters all along the Eastern Seaboard. You can read about them here.
Gwynnie took this photo of a male Can in breeding plumage on Saturday in CT. The sloped head is diagnostic, even in poor light. I suspect that he used a long lens: