fish eagle vs western osprey

fish eagle

noun
  • Any of several species of birds of prey that feed on fish in the genus Haliaeetus (syn. Ichthyophaga). 

  • The osprey (Pandion haliaetus). 

western osprey

noun
  • A fish-eating bird of prey of the species Pandion haliaetus. 

How often have the words fish eagle and western osprey occurred in a corpus of books? (source: Google Ngram Viewer )