These little birds are easily one of my favorite ducks. Mergansers have bills with serrated edges to help them catch fish and other prey, which they usually do after diving under the surface of the water. They're beautiful birds, and even though I see them frequently here in FL, I can't help but stop to photograph them whenever I see them. The above photograph was actually taken at a retention pond at my son's school.
Hooded Mergansers (Female) with one returning to the surface
As you can see, males and females look very different from each other, and they also have different looks depending on whether their "hood" is up or down.