We are grateful to Jane M. Hicks for help in reviewing literature, and to Angela M. Kokott and Ann S. Zimmerman for obtaining numerous references. Ronald D. Drobney offered some suggestions on the Wood Duck model presented in Section VIII. Evan G. Cooch and Fred Cooke provided valuable information about Snow Geese and commented on the Snow Goose model; they nonetheless should be held blameless for any misleading conclusions drawn therefrom. The manuscript was improved by constructive comments from Hugh Boyd, Lewis M. Cowardin, F. Graham Cooch, John A. Kadlec, Rolf R. Koford, David G. Krementz, Kenneth J. Reinecke, and especially Dennis G. Raveling and Hilary Swain.
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