A. Spider Monkey 



B. i>aibary Ape 



C. Gorilla 



D. Chimpanzee 



Figure 363. Primates. A, spider monkey, Ateles ater, a New World (South American) species. 

 It has a prehensile tail which functions as a fifth appendage and a great toe and thumb opposable 

 to other digits. B, barbary ape, Macaca sylvana, an Old World monkey. C, gorilla. Gorilla gorilla, 

 {SVi feet long, weight 500 pounds). It is the largest and possibly the most intelligent of the 

 great apes. D, chimpanzee, Pan troglodytes. It has large ears, long lips, and nails on fingers and 

 toes. (Courtesy of N.Y. Zoological Society.) 



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