BIOME AND BIOME-TYPE IN WORLD DISTRIBUTION 



589 



series of grasslands was apparently con- 

 nected, to judge from conspicuous fauna! 

 relations and well-documented emigrations 

 and immigrations of animal types now 

 characteristic of the plains, on repeated oc- 



casions, into and from the plains of western 

 North America, which in modern times ex- 

 tend from Mexico City to central Canada 

 east of the Rocky Mountains. These rela- 

 tively related and "homologous" grasslands 



Fiff. 222 



Fig. 223 

 Fig. 222. The grassland biome; characteristic animals of the African grasslands, zebra and 



wildebeest, Kruger National Park, Transvaal. (Photograph by Herbert Lang.) 

 Fig. 223. The square-lipped rhinoceros, specifically a grazing type of the African grasslands, 

 Kruger National Park, Transvaal. ( Photograph by Herbert Lang. ) 



