curlew vs sandpiper

curlew

noun
  • Any of several migratory wading birds in the genus Numenius of the family Scolopacidae, remarkable for their long, slender, downcurved bills. 

  • A stone curlew. 

sandpiper

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

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