﻿Smithsonian 
  Report, 
  1943.- 
  -Friedmann 
  

  

  Plate 
  4 
  

  

  1. 
  Photograph 
  from 
  life. 
  

  

  2. 
  Bird 
  retouched 
  to 
  remove 
  color 
  pattern. 
  

  

  The 
  Obliterating 
  Effect 
  of 
  Color 
  Resemblance 
  in 
  the 
  

  

  White-Tailed 
  Ptarmigan 
  (Lagopus 
  leucurus). 
  

  

  