laughing dove vs turtle dove

laughing dove

noun
  • A small pigeon (Spilopelia senegalensis) native to the tropics in Africa south of the Sahara; the Middle East; and southern Asia east to India. 

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). 

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