Barbary dove vs ring-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. 

ring-dove

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