sandpiper vs wood sandpiper

sandpiper

noun
  • Any of various small wading birds of the family Scolopacidae. 

wood sandpiper

noun
  • A Eurasian species of small wader birds, Tringa glareola, that is the smallest of the shanks. 

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