African buffalo vs Cape buffalo

African buffalo

noun
  • A large African bovid, Syncerus caffer. 

Cape buffalo

noun
  • A large African bovid, Syncerus caffer. 

  • The subspecies Syncerus caffer caffer found in southern and eastern Africa. 

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