﻿U. 
  S. 
  DEPARTMENT 
  OF 
  AGRICULTURE 
  

  

  BIOLOGICAL 
  SURVEY— 
  BULLETIN 
  No. 
  26 
  

  

  C. 
  HART 
  MERRIAM, 
  Chief 
  

  

  DISTRIBUTION 
  AND 
  MIGRATION 
  OF 
  NORTH 
  

   AMERICAN 
  DUCKS, 
  GEESE, 
  

  

  AND 
  SWANS 
  

  

  BY 
  

  

  WELLS 
  W. 
  COOKE 
  

  

  Assistant, 
  Biological 
  Survey 
  

  

  WASHINGTON 
  

  

  GOVERNMENT 
  PRINTING 
  OFFICE 
  

  

  1906 
  

  

  