Food-Getting and Food-Using Digesting food is but a special detail 

 of the total activity of a living organism, and it is related to the whole man- 

 ner of living. The main divisions of the food tube are much alike in all 

 classes of vertebrates, and even in other classes; but many differences in 

 detail are seen to be related to the kinds of food eaten, to modes of locomo- 

 tion, to the sense organs, to the whole scheme of habits. Thus, most preda- 

 tory, or preying, animals have a short food tube; this appears to be related 

 to the relatively high protein content of the food. 



All predatory animals, whether tiger beetle or shark, falcon or rattler, 

 squid or lion, have powerful offensive weapons. Tigers, lynxes, leopards, 

 and other cats have supple bodies, sharp claws, pointed teeth, and a stealthy 



THE VERMIFORM APPENDIX 



The blind sac is relatively smaller in some orders of mammals than in others. It is 

 least active in digestion among the primates. In the human species, it is actually 

 larger in the fetus than in the adult 



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