I went back to the Heron Lakes pond to get some better photo's. Half of the lake is iced up and a few more ducks are present. Saw some a nice pair of Buffle Head males but my zoom lense just don't get a good enough picture.
Here are the best shots I got of a male and female cans.
In this last picture, what the the two ducks to the left and front of the female cans.