great grey owl vs screech owl

great grey owl

noun
  • Strix nebulosa, a very large owl. 

screech owl

noun
  • Any New World owl of genus Megascops. 

  • A common barn owl, of species Tyto alba, found almost worldwide. 

  • The mistle thrush (Turdus viscivorus). 

How often have the words great grey owl and screech owl occurred in a corpus of books? (source: Google Ngram Viewer )