4 THE FOOD OF ANIMALS 



and the pig, affect a mixed diet. A higher animal possesses 

 many characters related to the nature of its food, and contrasting 

 strongly with the relative features of higher plants, as enumerated 

 above. Such are, in particular, a compact shape, an internal 

 digestive cavity, powers of locomotion, and well-developed nervous 

 system with related sense organs. 



It will not be uninteresting to consider flesh-eating, plant- 

 eating, and omnivorous animals successively, with special refer- 

 ence to the ways in which they are modified as a result of their 

 proclivities in the matter of food. After this we will briefly 

 review some of the innumerable devices and structural modifica- 

 tions which help animals to escape from those predaceous forms 

 which have developed a gastronomic liking for them. 



