MAMMALIA 



281 



a nonopposable thumb, and the absence of wisdom teeth. 

 The Neiv World monkeys are marked by a flattened nose 

 with the nostrils separated by a broad septum. They 

 range from Mexico to Brazil. Many of them have pre- 

 hensile tails with which they are able to support themselves 

 from the limbs of trees. 



The best known groups of the Old World monkeys are the 

 baboons, apes, and gibbons. The baboons have long, 

 doglike noses and 

 live only in Af- 

 rica. They travel 

 in troops of a dozen 

 or more, robbing 

 grain fields and 

 fighting fiercely 

 when attacked. 



The anthropoid 

 apes (Simiidce), of 

 which there are 

 about ten species, 

 include those mon- 

 keys having no 

 tails and for the 

 mosL part bearing 

 a striking resem- 

 blance in structure 

 to man. The gib- 

 bons are of small 

 size, slender pro- 

 portions, and of low intellect. They inhabit Borneo, Su- 

 matra, the Malay Peninsula, and Siam, The gorilla (Gor- 



FIG. 318. Gorilla shot and photographed in West 

 Africa. By permission of the Academy of Natural 

 Sciences. 



