The male and female look nothing alike, as far as coloring goes. However, they do have the same basic body shape and bill shape.
The male is white, with a greenish-black head, black back feathers, and a red bill.
The female is more of an overall silver-grey with a white chin patch, rusty brown head (with crest) and a red bill.
Common mergansers are sometimes called sawbills because of their serrated beaks - the only ducks to have such a feature. Another interesting fact about them is that the females are crested, but the males are not.
They may not look like a matched set, but these two were very happy to be sailing along together, and in a relatively short time they will be building a nest and sitting on some eggs!
I've written about mergansers before, here:
http://foundonthetrail.blogspot.com/2013/02/another-merganser.html
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