antelope vs ibex

antelope

noun
  • Any of several African mammals of the family Bovidae distinguished by hollow horns, which, unlike deer, they do not shed. 

  • The pronghorn, Antilocapra americana. 

ibex

noun
  • An imaginary creature with serrated horns, somewhat similar to the heraldic antelope. 

  • A type of wild mountain goat of the genus Capra, such as the species Capra ibex. 

How often have the words antelope and ibex occurred in a corpus of books? (source: Google Ngram Viewer )