UNGULATA ; CAMELS AND LLAMAS. 99 



Asia, and are as indispensable to the merchant and traveler 

 in crossing the deserts of the Old World, as are vessels for 

 crossing the ocean. Their wonderful power of going a 

 long time without drinking is due to the large number 

 of cells on the walls of the paunch, in which is stored an 

 extra supply of water. Camels are about ten feet long 

 and eight feet high. 



The Llamas (Auchenia) are confined mainly to the 

 Andes, and are somewhat larger than sheep. Besides 



FIG. 104. 



Llama, Auchenia llacma, Linn. 



being smaller than the Camels, they further differ from 

 them in having no humps, and in having the two toes 

 entirely separate. 



Another very remarkable form of artiodactyl ungulates 

 is seen in the Giraffe, whose neck is so long that its head 

 is sixteen or eighteen feet from the ground ! Both sexes 

 have "short conical horns which are covered with a hairy 

 skin, and which are never shed. By its whole structure the 

 Giraffe is fitted for subsisting upon food which grows 



