common raven vs harpy

common raven

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

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

harpy

noun
  • A large and powerful double-crested, short-winged American eagle (Harpia harpyja). 

  • The European moor buzzard or marsh harrier (Circus aeruginosus). 

  • One who is rapacious or ravenous; an extortioner. 

  • A mythological creature generally depicted as a bird-of-prey with the head of maiden, a face pale with hunger and long claws on her hands personifying the destructive power of storm winds. 

  • A shrewish woman. 

How often have the words common raven and harpy occurred in a corpus of books? (source: Google Ngram Viewer )