Cepphus columba, Auk egg

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A pigeon guillemot (Cepphus columba columba) egg collected by F. R. Decker from Flat Top Island, Island County, Washington in June 1919. Decker notes that incubation of the egg was advanced at time of collection with the egg "resting on trash in grass in rocks above tide."

Original set mark: 4/1, Decker Collection