While scanning for a King Eider in the channel between St. Joesph and Benton Harbor I spotted this trio of waterfowl. At the top is a male American Black Duck and below is a male (R) and female (L) Mallard. Its distinction as a male is due to the yellow-green bill. Although the perspective of the shot makes them look about the same size the Black Duck is in fact somewhat larger than the Mallards.
The story of our search for the King Eider, which includes pics of other birds found along the way can be found HERE.
An Irish rascal!