Capra ibex vs ibex

Capra ibex

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 Capra ibex and ibex occurred in a corpus of books? (source: Google Ngram Viewer )