CALLS AND MUSIC 



21 



■which it uses very frequently, and has the habit alse 

 of " squeaking out " as it leaps into the water when 



Fig. 13. — Tlie bullfrog (Rana catesbiana). 



disturbed. The spadefoot toad croaks ^fearfully in a 

 deep rasp — as if his vocal apparatus needed oiling; 

 and the voice of the 

 bullfrog (Fig. 13)— 

 especially when quiet 

 and reflective in the 

 later season — is de- 

 scribed as " jug-er- 

 rum," with a deep 

 really musical ring at 

 times. Again it may 



be a series of very ex- -M^af ^gmmm mni^,'' 



plosive "chee-ungs" ^V^^^^S.. A 



very far apart ; but Fiq. U,— Tree-toad {Syla verskolor). 



