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or less nearly related to the chamois, which it resembles in 
many of its habits and ways. It is a native of rugged and 
elevated mountains from central Idaho to British Columbia 
and Alaska. They are exceedingly rare in collections. 
The Prong-horned Antelope {Antilocapra americana ) is 
remarkable on account of the formation of its horns in a 
THE PRONG-HORNED ANTELOPE. 
manner peculiar to itself alone. The horns of this species 
resemble in appearance those of the hollow-horned rumi¬ 
nants, in which the external covering of horny material grows 
around a solid, bony core. In this antelope, however, the 
outside horny part is shed and replaced, it is thought by some 
naturalists, annually, as in the deer; but with the important 
difference, that in the deer the antler is formed directly by a 
