Greater Scaup is a duck species in decline in North America. They winter in significant numbers locally, and are seemingly more common then their Lesser Scaup cousins. Here are a few photos taken from a dock in Hamilton as they mingled with the other ducks.
Greater Scaup (drake) (click to enlarge) - Canon 50D 600 f4 IS
Greater Scaup hen (click to enlarge) - Canon 50D 600 f4 IS
Greater Scaup preening (click to enlarge) - Canon 50D 600 f4 IS