aurochs vs tur

aurochs

noun
  • The European bison (Bison bonasus, or Europæus). 

  • An extinct European mammal, Bos primigenius, the ancestor of domestic cattle. 

tur

noun
  • Either of two species of wild goat native to Caucasus, West Caucasian tur Capra caucasica or East Caucasian tur Capra cylindricornis. 

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