VERTEBRATA 



They range from the equator to the poles, over every 

 continent, over mountains and plains, deserts and woods. 



FIG. 181. Incisor teeth of the hare. 



The more important representatives are the porcupines, 

 capybaras, guinea-pigs, hares, mice, rats, squirrels, and 



FIG. 182. Beaver {Castor canadensis). North America. Copyright, 1900, by 

 A. Radcliffe Dugmore. 



beavers. The capybara and beaver are the giants of 

 the race. 



