PROTECTION FROM ENEMIES 318 



severe electric shock to any foe daring to touch them. 

 Some of the catfish possess poisoned barbs in the thoracic 

 fin which are used in contests. A few of the snakes have 

 a pair of long teeth, called fangs, in the upper jaw, through 

 which they inject into any creature disturbing them a 

 deadly poison. The rattlesnakes, copperhead, and south- 

 ern moccasin are the only poisonous snakes to be feared 

 in our country. 



Among mammals the weapons of defense are varied. 

 The antlers of the deer and the horns of the cattle are often 

 used with telling effect against their foes. The tusks of 



FIG. 350. Kallima butterfly on the right, leaf on left. Photograph life size- 



