THE CLASS BIEDS. 



295 



granivorous have the bill short, thick, arched above, or 

 conical, and generally straight (Fig. 243). The pelicans pre- 

 sent a remarkable modification of the bill ; between the two 



Fig. 239.-The Yellow Vulture. 



Fig. 240. Cigogne a Sac 

 (Adjutant). 



branches of the lower jaw there is a wide cutaneous expan- 

 sion or bag, in which they store their food (fishes), to disgorge 

 it afterwards, and to feed on it at their leisure. 



Fig. 241. Guepier 

 (Bee-Catcher). 



Fig. 242. Goat-sucker. 



But some birds present singularities in the form of the bill, 

 the uses of which are not understood. Such for example is 

 the bill of the rhinoceros hornbill, or calao (Fig. 246). 



