bird of prey vs carnivore

bird of prey

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

carnivore

noun
  • A mammal belonging to the order Carnivora. 

  • An organism that feeds chiefly on animals; an animal that feeds on meat as the main part of its diet. 

  • A follower of the carnivore diet (consuming only animal-based products, such as meat, eggs and dairy) 

  • A person who is not a vegetarian. 

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