lovebird vs wood pigeon

lovebird

noun
  • Any small parrot from one of the nine species within the genus Agapornis. Sometimes they are kept as cage birds and are noted for their affection towards each other. 

  • One of the members of an openly affectionate couple. 

verb
  • To express romantic affection openly. 

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 lovebird and wood pigeon occurred in a corpus of books? (source: Google Ngram Viewer )