carrion crow vs corvid

carrion crow

noun
  • The common European black crow Corvus corone. 

  • The American black vulture Coragyps atratus. 

corvid

noun
  • A member of the bird family Corvidae, including crows, ravens, jays, choughs, treepies etc. 

adj
  • Pertaining to or resembling the Corvidae. 

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