302 



PRACTICAL ZOOLOGY 



The leopard frog (pp. 245-267) is the most common of the 

 water frogs, but it has a number of relatives in this country 

 worth mentioning. Of these the bullfrogs are the largest, 

 reaching a length of six or eight inches. They possess a 



FIG. 180. Mud eel. (Photograph of living animal from Report N. Y. 



Zool. Soc.) 



deep, bass voice like that of a bull, and when a number are 

 engaged in a nocturnal serenade, they can be heard for a con- 

 siderable distance. Bullfrog tadpoles do not become frogs the 

 first year as do those of the leopard frog, but transform during 

 the second or even the third year. 



