252 



GENERAL ZOOLOGY 



A toad has two methods of locomotion hopping and 

 walking. The whole body is adapted structurally for 

 progression by leaping, and in moving about that method is 

 usually employed, but at close quarters a toad is able to 

 stalk its food as cautiously as a lynx. An active insect, 

 however, is often secured by leaping upon it from a distance 

 of two or three feet. 





A Be 



FIG. 98. Salientia. A, Wood frog and green frog; B, the garden toad, 

 Bufo americanus male singing, catching fly, egg string, tadpoles; C, tree frog 

 and cricket frog. 



The metabolic processes of a toad are much like those of 

 other cold-blooded vertebrates. The digestive and excre- 

 tory organs resemble those of Necturus. The circulatory 

 and respiratory systems are, however, adjusted to life on 

 land. The blood-vessels which supply the gills during 

 larval life are diverted to the lungs and skin when terres- 



