bezoar goat vs ibex

bezoar goat

noun
  • A wild goat, Capra aegagrus, native to Asia Minor and the Middle East and also found on Crete, now believed ancestral to the domestic 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. 

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