THE SHEEP AND ITS VARIETIES. 



609 



States by the common Virginian deer ( Cariacus Virginianus 

 ■Gray, Fig. 526), the elk or wapiti {Gervus Canadensis Erxle- 

 l)en, Fig. 537), and the caribou {Rangifer caribou Audubon 

 ^nd Bachman), which is probably a variety of the European 

 reindeer {R. tarandus Sundevall). In these beautiful, grace- 

 ful forms the solid antlers are cast off annually ;* with the 

 exception of the reindeer the females or does have no antlers. 

 The prong-horn antelope {Antilocapra Americana Ord, 



Fig. 528.— Head of young Prong-horn Antelope.— After Hays. 



Fig. 528) SO characteristic of the western plains, also drops 

 its horns in the autumn, though they are hollow when shed 

 and with a persistent core as in the ox and goat. It crops 

 grass, not, like the deer, eating leaves of trees and shrubs ; 

 " in fleetness it excels all other quadrupeds of our conti- 

 nent," though it is short winded, and does not run a great 

 distance (Caton). In its horns, hollow when cast oil, and the 

 gall bladder, which is absent in the Cervidm, the prong-horu 



