﻿Smithsonian 
  Report, 
  1943. 
  Friedmann 
  

  

  PLATE 
  3 
  

  

  1 
  . 
  COUNTERSHADING 
  AND 
  COLOR 
  RESEMBLANCE 
  IN 
  THE 
  

   SANDERLING 
  (CROCETHIA 
  ALBA). 
  

  

  (Drawn 
  by 
  W. 
  A. 
  Weber.) 
  

  

  2. 
  COLOR 
  RESEMBLANCE 
  WITHOUT 
  COUNTERSHADING 
  IS 
  NOT 
  ENOUGH. 
  

  

  The 
  white-tailed 
  ptarmigan 
  is 
  revealed 
  by 
  its 
  visual 
  solidity 
  and 
  by 
  its 
  shadow. 
  (Drawn 
  by 
  W. 
  A. 
  Weber.) 
  

  

  