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    • Spacing Patterns, Mating systems, and winter Philopatry in Harlequin ducks. 

      Gregory, J.R.; Cooke, F.; Goudie, R.I.; Boyd, W.S. (University of California Press, 2000)
      Many species of waterfowl form pair bonds during the nonbreeding season, yet current descriptions of mating systems and patterns of philopatry in waterfowl focus on the breeding grounds. We studied wintering Harlequin Ducks ...

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