barred owl vs great horned owl

barred owl

noun
  • A large American owl (Strix varia) with dark brown transverse bars on the breast. 

great horned owl

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

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