ibex vs kidney

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. 

kidney

noun
  • This organ (of an animal) cooked as food. 

  • An organ in the body that filters the blood, producing urine. 

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