304 ‘ ANIMAL PHYSIOLOGY. 
The teeth as triturating organs find their highest develop- 
ment in ruminants, the combined side-to-side and forward-and- 
backward motion of the jaws rendering them very effective. 
Fie. 265. 
Fie. 264. 
Fic. 264.—Dentition of inferior j jaw of horse (after Chauveau). ‘ 
Fig. 265.—Inferior maxilla of man (after Sappey). Alveolar border; /, incisor teeth: c, canine 
teeth ; b, bicuspid teeth ; m, molars. 
In Carnivora the teeth serve for grasping and tearing, while 
in the Insectivora the tongue, as also in certain birds (wood- 
peckers), is an important organ for securing food. 
It is to be noted, too, that, while the horse crops grass by 
biting it off, the ox uses the tongue, as well as the teeth and 
lips, to secure the mouthful. 
