turtle dove vs wood pigeon

turtle dove

noun
  • Any of several (species of) birds, called by this traditional name, mainly in the genus Streptopelia, of the family Columbidae (doves and pigeons, which also included the extinct passenger pigeon, dodo, and solitaire). 

wood pigeon

noun
  • Any of several related species of pigeon in the genus Columba. 

  • The common wood pigeon, an Old World species of pigeon, Columba palumbus. 

  • A very large (up to 650 grams) species of pigeon native to New Zealand, Hemiphaga novaeseelandiae. 

How often have the words turtle dove and wood pigeon occurred in a corpus of books? (source: Google Ngram Viewer )