^ 



America. During most of the Pleistocene it lived in the western 

 hemisphere, but it became extinct before white men appeared on 

 the American scene. Exceedingly strong evidence was also found 

 indicating that the zebra was of North American origin. It lived 



THE HISTORY OF 

 HORSE DISTRIBUTION 



MOST OF THE EVOLUTION OF THE HORSE FAMILY 



TOOK PLACE IN NORTH AMERICA. 



ABOUT 5.OOO.000 YEARS AGO ANCESTRAL 



HORSES MIGRATED TO ASIA. 



TRUE HORSES PROBABLY EVOLVED IN ASIA 



ABOUT 1.000,000 YEARS AGO. 



FROM ASIA THEY SPREAD TO EUROPE AND 



TO THE WESTERN HEMISPHERE 



THE ZEBRA EVOLVED IN NORTH AMERICA AND 



ABOUT 1,000,000 YEARS AGO 



SPREAD TO EURASIA AND AFRICA. 



THEN THE ZEBRA BECAME EXTINCT IN AMERICA... 





THE HORSE FAMILY IS NOW CONFINED TO 



SMALL AREAS IN ASIA AND AFRICA. 



HORSES NOW IN THE AMERICAS WERE 



INTRODUCED BY WHITE MAN. 



Fig. 14. A graphic presentation of the distribution of the horse through its 

 long geologic history (Figs. 13 and 14 represent the two parts of the exhibit show- 

 ing the evolution and distribution of the horse; Hall 38). 



on this continent until early Pleistocene times and then spread to 

 Asia, Europe and Africa. Soon thereafter it became extinct every- 

 where except in Africa (see Fig. 14). 



In other sections of the Department, owing to the absence of 

 most of the scientific staff on war work, there has been no research. 



49 



