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   Harlequin Duck
   Histrionicus histrionicus
 Male
 Yellowstone National Park
 Wyoming
 14 May 2014
     
 by John Crawley
 ŠJohn Crawley
   Harlequin Duck
   Histrionicus histrionicus
 Male
 Yellowstone National Park
 Wyoming
 14 May 2014
     
 by John Crawley
 ŠJohn Crawley
   Harlequin Duck
   Histrionicus histrionicus
 Male
 Yellowstone National Park
 Wyoming
 14 May 2006
     
 by Paul Higgins
 ŠPaul Higgins