tawny owl vs western barn owl

tawny owl

noun
  • A species of strigid owl, Strix aluco, of Europe, western Asia, and the Middle East. 

western barn owl

noun
  • A barn owl of the subspecies Tyto alba alba, endemic to western Eurasia and most of Africa. 

How often have the words tawny owl and western barn owl occurred in a corpus of books? (source: Google Ngram Viewer )