Ducks seen along the lakeshore over the last few days ranged in weight from about 370 to 5000 g.
A duck of our winter waterways the Bufflehead Duck, at about 370 g, is second in tininess to the slightly smaller Green-winged Teal. This bufflehead is a male.
Still a fairly small duck, but at about 600 g, the Wood Duck is 60% heavier than the bufflehead. The female is on the left and the male is on the right.
At about 1100 g, the Mallard is about 80% heavier than the Wood Duck. There are a number of male and female mallards in this picture, but the giant in the centre is a Rouen Duck. At about 5000 g, it weighs over four times that of the mallard, but is a domestic breed of its smaller cousin. This escapee was also seen hanging out with mallards about two years ago (Rouen Duck).