trumpeter pigeon vs trumpeter swan

trumpeter pigeon

noun
  • Any of a number of breeds of domestic fancy pigeon, Columba livia domestica, descendants of the wild rock pigeon, Columba livia, of the family Columbidae (pigeons and doves) (originally bred for their peculiar gurgling voice, a prolonged coo called "trumpeting" or "drumming"). 

trumpeter swan

noun
  • The largest North American swan, Cygnus buccinator; they have white plumage with a long neck, a short black bill. 

How often have the words trumpeter pigeon and trumpeter swan occurred in a corpus of books? (source: Google Ngram Viewer )