THE CLASS BIEDS. 297 



248). In the parrot, which to a certain degree masticates its 

 food, the tongue is thick and fleshy ; in birds of prey it is 



Fig. 246. Calao a Casque en croissant (Rhinoceros Hornbill). 



still somewhat large and soft ; in most of the granivora 

 (Fig. 247), it is dry, triangular, and rough towards its base, 



Fig. 247.* 



with small cartilaginous points ; finally, in certain insectivora 

 its extremity is armed with hooks, and serrated or notched. 



* Tongue, glottis, &c. : /, the tongue ; A, hyoid bones ; m, muscles of the 

 hyoid ; p, pharynx ; g, glottis ; t t trachea ; e y gullet. 



