black-headed gull vs northern lapwing

black-headed gull

noun
  • A small gull, Chroicocephalus ridibundus, which breeds in much of Europe and Asia, and also in coastal eastern Canada. 

northern lapwing

noun
  • A crested plover, Vanellus vanellus. 

How often have the words black-headed gull and northern lapwing occurred in a corpus of books? (source: Google Ngram Viewer )