STEPPES OF ASIA AND AMERICA 61 
both as to individuals and as to species, and often show 
some curious adaptations to steppe life. 
A point of very considerable interest in regard to 
the steppe rodents is that there is much general resem- 
blance between those inhabiting Asia and those of 
North America. This is the more remarkable in that 
there is no resemblance in regard to the ungulates of 
Fic. 7. Transport Camels in the Australian Desert. 
the two regions. The prairies of North America have 
no antelope, no camel, no wild: horse nor ass. Their 
chief ungulate was formerly the bison (Bos americanus), 
while the bison of the temperate regions of the Old 
World was a forest-dwelling animal, found in Europe, 
but not in the steppes of Asia. The other important 
ungulate of the North American prairies is the prong- 
buck (Antilocapra americana), an animal related to the 
antelopes, but differing markedly in the fact that the 
