Arctic skua vs man-of-war

Arctic skua

noun
  • A seabird (Stercorarius parasiticus), of the skua family (Stercorariidae) 

man-of-war

noun
  • The Arctic skua (Stercorarius parasiticus). 

  • A man whose occupation is fighting in wars; a soldier, a warrior. 

  • A powerful armed naval vessel, primarily one armed with cannon and propelled by sails; a warship. 

How often have the words Arctic skua and man-of-war occurred in a corpus of books? (source: Google Ngram Viewer )