82 WHAT EVOLUTION IS 



blance to twigs. Anyone who has 

 taken the trouble to acquaint himself 

 with examples of this kind must have 

 been struck with the perfection of the 

 resemblances and with the evident 

 protection that the creature enjoys 

 through being mistaken by its foes 

 for something other than it is. It 

 was this principle that toward the end 

 of the Great War led to the camou- 

 flaging of vessels, of artillery, and 

 even of men. The insects that are 

 camouflaged do not acquire this state 

 through individual activity, but are 

 hatched out in this condition. They 

 receive their protective markings 

 fully formed, in the nature of birth- 

 rights as it were, and no efforts on 

 their part make the camouflage more 

 or less complete. In this respect, the 

 insects are quite unlike the fishes, 

 the frogs and toads, and especially the 

 chameleons where the colors of the 



