laughing gull vs sea crow

laughing gull

noun

  • An American gull (Leucophaeus atricilla); in summer the head is nearly black, the back slate color, and the five outer primaries black. 

  • A common European gull (Xema ridibundus). 

sea crow

noun

  • The blackheaded pewit, and other gulls. 

  • The Western jackdaw. 

  • The chough. 

  • The skua. 

  • The cormorant. 

  • The razorbill. 

  • The coot. 

How often have the words laughing gull and sea crow occurred in a corpus of books? (source: Google Ngram Viewer )