laughing gull vs sea raven

laughing gull

noun
  • A common European gull (Xema ridibundus). 

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

sea raven

noun
  • Any fish in the family Hemitripteridae. 

  • The cormorant. 

  • An American cottoid fish, Hemitripterus americanus, allied to the sculpins. 

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