444 



THE ANIMALS AND MAN 



great everlasting snow-fields of the arctic regions live foxes and 

 hares and ptarmigan, all white as the snow itself, although 

 their near cousins the foxes, hares, and ptarmigans of warmer 

 regions, where the snow 

 falls but occasionally, and 

 the earth's surface is usually 

 brown and dark, are red- 

 dish or gray or brown. In 

 the desert the lizards and 

 snakes and insects are mot- 

 tled gray and sand-colored, 

 while in the evergreen foli- 

 age of trees in warm re- 

 gions live green tree-frogs 

 and tree-snakes and insects. 

 Special protective resem- 

 blance. But some animals 

 show more than just a 

 general resemblance to, or 

 harmony with, the color 

 tone of their surroundings; 

 they show a striking resem- 

 blance to some particular 

 part of their surroundings. 

 An insect common all over 

 the country, but only rare- 

 ly distinguished and recog- 

 gnized, is the walking-stick 

 insect (fig. 230). Its body 

 is long, and slender, its 

 legs very long and held 

 stiffly and angularly, and 

 it has no wings. Its body 



11 i i %i 



and legs are colored either Diapheomera fem0 raa. 



dull green all over, or (Natural size.) 





FIG. 230. The twig insect or walking- 







