cluck vs common raven

cluck

noun
  • The sound made by a hen, especially when brooding, or calling her chicks. 

  • A kind of tongue click used to urge on a horse. 

  • Any sound similar to this. 

verb
  • To cause (the tongue) to make a clicking sound. 

  • To call together, or call to follow, as a hen does her chickens. 

  • To make such a sound. 

  • to suffer withdrawal from heroin. 

common raven

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

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

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