Wayne R. Petersen
David M. Larson
Regular readers of Bird Observer may recall that the October issue’s mystery bird was a waterfowl, a female Common Eider. For December I am once again featuring a duck, a fact that I am readily disclosing because unlike the duck in the last issue, its features are unambiguous. The combination of its chunky shape, relatively flat and round-tipped bill shape, and prominent white on the wing remove all other species except possibly a Black Guillemot, which would show a sharp pointed bill and noticeably less blocky shape. No, this is a real duck!
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. Bird Observer publishes original articles on birding locations, on avian populations and natural history, on regional rarities, and field notes, Massachusetts field records, photographs, and art work.