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C. J. Henny and R. P. Morgan, II, founded the hybrid flock maintained at Northern Prairie Wildlife Research Center. F. B. Lee conducted the mating trials. Study skins were prepared at the Smithsonian Museum of Natural History by C. J. Angle and R. M. Browning. Access to museum specimens was provided by R. C. Banks (Smithsonian Museum of Natural History), R. A. Paynter, Jr. (Museum of Comparative Zoology), W. E. Lanyon (American Museum of Natural History), F. B. Gill (Academy of Natural Sciences), A. Allison and J. G. Harrison (private collections, Great Britain), and their respective staffs.

Library work was facilitated by L. J. Garrett, K. M. Lahlum, the staff of the Harvard University Libraries, staff of the Smithsonian Institution Museum of Natural History Library, and the late F. M. Uhler, who allowed access to his personal collection of original works on birds. We thank C. D. Ankney, the late W. W. Blandin, H. Boyd, S. M. Carney, D. G. Dennis, H W Heusmann, J. R. Longcore, R. S. Palmer, and J. K. Ringelman for providing personal insight on Black Duck ecology during the course of this study. J. R. Longcore, E. M. Martin, J. R. Serie, G. W. Smith, J. S. Wendt, and especially M. R. Miller, N. R. Seymour, and an anonymous referee are thanked for their reviews of drafts. D.H. Johnson graciously served as editor of this monograph.