Buffleheads are the smallest diving ducks, no larger than 16 in (40 cm) in length. They are a joy to see as they appear to be constantly smiling and moving about, bobbing, and diving to find food. They swallow their catch of crustaceans (shrimps) and mollusks under water, and I have yet to see a photo of one Bufflehead holding food in its short, smily bill.
In past years I usually had a hard time taking good pictures of them, especially the male ones, because their eyes are often lost in the dark patches around their heads. This year sunlight was with me, most of the time, as you can see in the following photos.