buteo vs carrion crow

buteo

noun
  • Any of the broad-winged soaring raptors of the genus Buteo. 

carrion crow

noun
  • The American black vulture Coragyps atratus. 

  • The common European black crow Corvus corone. 

How often have the words buteo and carrion crow occurred in a corpus of books? (source: Google Ngram Viewer )