ibex vs wild goat

ibex

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

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

wild goat

noun
  • Capra aegagrus, a species or goat believed ancestral to and including the domestic goat. 

  • Used other than figuratively or idiomatically: see wild, goat. 

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