PROTECTION FROM ENEMIES 321 



This phase of protective coloration is known as mimicry. 

 Certain flies resemble the stinging bees so closely that one 

 must catch them before he can be quite sure of their 

 identity. Some butterflies have wings like those of a 

 few species which are left untouched by the birds because 



PIG. 360. The snowy owl visiting the United States only in winter. Photo- 

 graph of specimen mounted by Neal. One sixth life size. 



of their bad flavor. The spotted adder (Fig. 248), a com- 

 mon harmless snake, when disturbed by an enemy coils 

 and vibrates the end of its tail much after the fashion 

 of the rattlesnake. 



Were it not for protective coloration and mimicry among 

 animals certain species would doubtless have suffered ex- 



