Barbary dove vs ringneck dove

Barbary dove

noun
  • A domesticated dove with unclear taxonomic classification, often treated as its own species as Streptopelia risoria, sometimes as a subspecies of either Eurasian collared dove, Streptopelia decaocto or African collared dove Streptopelia roseogrisea, and sometimes not as separate species at all, freely breeding with the above species. 

ringneck dove

noun
  • A domesticated dove with unclear taxonomic classification, often treated as its own species as Streptopelia risoria. Other sources classify it as subspecies of either Eurasian collared dove, Streptopelia decaocto or African collared dove Streptopelia roseogrisea. 

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