CHAPTER I\ 



EXTINCT GIRAFFES AXD THE OKAPI THE 



GIANT SLOTHS OF SOUTH AMERICA AND 

 THE GIANT KANGAROOS OF AUSTRALIA. 



THERE are a vast number of mammalian 

 extinct animals, related to the cattle, 

 sheep, goats, antelopes, deer, lions, bears and 

 hyenas of to-day, and other less-known warm- 

 blooded hairy quadrupeds, besides many, such 

 as the Dinoceras and Arsinoitherium, which have 

 left no successors like themselves to represent 

 them in our days. Of both kinds, those which 

 have quite died out and disappeared and those 

 which have representatives alive to-day, you 

 may see the bones and skulls in the Natural 

 History Museum. I have not space here 

 to speak of more than a few extinct crea- 

 tures, and will at once ask you to look at 

 some members of the group which to-day is 



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