bird of prey vs peregrine falcon

bird of prey

noun
  • A carnivorous bird that hunts for its food, especially one that preys on vertebrates. 

peregrine falcon

noun
  • A medium-sized, very swift falcon, Falco peregrinus, that hunts small birds. 

How often have the words bird of prey and peregrine falcon occurred in a corpus of books? (source: Google Ngram Viewer )