goshawk vs merlin

goshawk

noun
  • Any of several birds of prey, principally in the genus Accipiter. 

merlin

noun
  • A small falcon, Falco columbarius, that breeds in northern North America, Europe, and Asia. 

  • A cytoskeletal protein active in the suppression of tumors. 

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