great horned owl vs horned owl

great horned owl

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

horned owl

noun
  • An owl of the genus Bubo native to the Americas, among the largest types of owl, having two horn-like tufts of feathers on its head. 

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