common raven vs corvid

common raven

noun
  • A large all-black passerine bird in the crow family, Corvus corax. 

  • A dark-colored South Asian swallowtail butterfly, Papilio castor 

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 common raven and corvid occurred in a corpus of books? (source: Google Ngram Viewer )