488 



COLLEGE ZOOLOGY 



1. Rumen Small intestine 



2. Reticulum 

 (honeycomb) 



4. Abomasum 

 (true stomach) 



. .:^ Esophagus 



Figure 360. A 4-compartment stomach of a ruminant animal (cow). The arrows show the 

 course of roughage such as hay. Grains such as corn go directly to the reticulum. This type of 

 stomach permits the animal to consume large amounts of grass; after which it seeks a place 

 safe from its enemies, where it can rechew its food. (After h.naiomy of the Domestic Animals, 

 by Sisson and Grossman. Copyright 1938 by W.B. Saunders Company.) 



Primates 



Primates are of special interest because 

 the order includes man. Primates inhabit 

 chiefly the warm parts of the worid. Most 

 are arboreal in habit and are able to climb 

 about among the trees because the great toe 

 and thumb are opposable to the other digits, 

 adapting the hands and feet for grasping. A 

 few primates lead a solitary life, but most 

 of them go about in troops. Fruits, seeds, 

 insects, eggs, and birds are the principal 

 articles of food. One young is usually pro- 

 duced at a birth; it is cared for with great 

 solicitude. Eleven families of living Primates 

 are recognized, and some interesting repre- 

 sentatives of these are described here. 



The lemurs are of small or moderate size 

 and usually possess a long nonprehensile 

 tail. They are mostly confined to Madagas- 

 car and neighboring islands. Their food is 

 mostly plants and small animals. 



The aye-aye is found in Madagascar; it 

 is one of the most remarkable of the lemurs 

 and is about the size of a cat. Its toes are 

 long and end in pointed claws. 



Tarsiers live in the Philippines and ad- 

 jacent islands. They are about the size of 



Figure 361. Rhesus monkey. {Macaca mulatta, 

 formerly M. rhesus.) Its humanlike behavior always 

 attracts a crowd at the "zoo." The rhesus (Rh) 

 factor, which is found in about 86 per cent of the 

 white population in the United States, was first 

 found in this monkey. (Courtesy of N.Y. Zoological 

 Society.) 



rats and have large eyes and rounded pads 

 at the ends of their toes. 



The marmosets are little primates ranging 

 from Central America to Brazil. They are 



