The Audubon Societies 



323 



in the world war will recognize in counter-shading and rupti\-e marks two of 

 the principles that were utilized as much as any to conceal battleships, large 

 guns, ammunition trains, and even small buildings. 



One other class of markings we might consider here since they are similar 

 to the ruptive marks in being themselves extremely noticeable. T refer to the 



WHERE 'COLOR PATTERN' COUNTS 



A. Ruffed Grouse on nest showing dead leaf and twig pattern 



B. Kark pattern of Screecli Owl 



C. Drift pattern of Pectoral Sandpipers 



D. Grass pattern of Meadow Lark, startled while at its nest 



E. Pebble pattern of young Killdeers 



