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  1. By: Ainley, David G - Lewis, T James - Morrell, Steve
    Type: Article
    In: The Wilson bulletin.
    Volume: 88
    Issue: 1
    Date: 1976
    Page Range: 76--95
    Publication info: Columbus, Ohio :Wilson Ornithological Society,1894-2005.
  2. By: Bekoff, Marc - Ainley, David G - Bekoff, Anne
    Type: Article
    In: The Wilson bulletin.
    Volume: 91
    Issue: 2
    Date: 1979
    Page Range: 255--270
    Publication info: Columbus, Ohio :Wilson Ornithological Society,1894-2005.