THE CLASS BIEDS. 



327 



parrot, which to a certain degree masticates its food, the 

 tongue is thick and fleshy ; in birds of prey it is still some- 



rig. 312. Ehinoceros Hornbill. 



what large and soft; in most of the granivora (Fig. 313), it 

 is dry, triangular, and rough towards its base, with small 



Fig. 313.* 



cartilaginous points ; finally, in certain insectivora its extre- 

 mity is armed with hooks, and serrated or notched. 



* Tongue, glottis, &c. ; I, the tongue ; h, hyoid bones ; m, muscles of the 

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



