great horned owl vs screech owl

great horned owl

noun
  • A large owl, Bubo virginianus, resident in North America, having tufts on its ears. 

screech owl

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

  • The mistle thrush (Turdus viscivorus). 

  • Any New World owl of genus Megascops. 

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