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Ducks fly over rough water on the Bay of Green Bay.

References used in the Egg webpages

Barrows, W.B. Michigan Bird Life. Michigan Agriculture College, 1912

Drent R., 1975. Incubation. Pp. 333-420 in Avian Biology, Vol. 5 (D. S. Farner and J. R. King, Eds.). New York, Academic Press.

Hickey, J.J. and D.W. Anderson. 1968. Chlorinated hydrocarbons and eggshell changes in raptorial and fish-eating birds. Science, 162:271-273.

Richter, Carl H. 1937. Bonaparte's Gull nesting in Wisconsin; a record. Oologist 54(1): 5-7.

Robbins, Samuel D. 1991. Wisconsin Birdlife: population and distribution past and present. 720 pp.

Van Winkle, E. The American Herring Gull. Bull. Mich. Orn. Club, I, 1897, p 33.

Van Winkle, E. The Caspian or Imperial Tern. Oologist, X, 1893, p 114.