MAMMALS 



489 



southern part of North America, the Swine of the Old World 

 are replaced by the more specialized Peccaries. The smaller 

 Collared Peccary (Dicotyles torquatus\ which has the wider 

 range, associates in small droves, while in the rather larger 

 White-lipped Peccary (D. labiatus), a purely South American 





Fig. 1003. Hind and Fawn of R( 



ipreohts 



form, a very large number of individuals herd together. Both are 

 forest animals and lead a wandering life, and the young of both 

 species are devoid of the stripes so characteristic of Old World 

 Pigs. One, or at most two, young ones are born at a time, and 

 the milk-glands are reduced to a single pair. Possibly the number 

 of young may have undergone reduction as an adaptation to the 

 exigencies of a roaming life. 



The gregarious Hippopotamus (Hippopotamus amphibius] pro- 



VOL. III. 



94 



