dark-eyed junco vs sunbird

dark-eyed junco

noun
  • Junco hyemalis, a passerine bird in the passerine family Passerellidae. 

sunbird

noun
  • A bird belonging to any of several species in the family Nectariniidae. 

  • A person, usually one who is retired, who travels from a warm climate to a colder one in the summer; one who oversummers elsewhere. 

How often have the words dark-eyed junco and sunbird occurred in a corpus of books? (source: Google Ngram Viewer )