436 



THE AGE OF MAMMALS 



•^>- 





By permission of theN.Y. Zoological Society mtuI II in\ < \\ Iiuim \ i imk 



Fig. 187. — Eurasiatic invaders of North America in the Pleistocene, 

 caribou (Rangifer), and moose (Alces). 



• "t musk ox). 

 The musk ox (Ovihos), 



