fruit fly vs praying mantis

fruit fly

noun
  • A woman who enjoys the company of homosexual men; a "fag hag". 

  • any insect of the Drosophilidae family, whose larvae feed on ripening fruit, especially the species Drosophila melanogaster that is used in genetic research. 

  • any insect of the Tephritidae family, whose larvae damage plant tissue. 

praying mantis

noun
  • A woman who preys on men (from the idea that female praying mantises eat males after sex). 

  • Any of various predatory, cannibalistic insects of the order Mantodea that have a prayer-like stance. 

  • A mantid of the species Mantis religiosa. 

How often have the words fruit fly and praying mantis occurred in a corpus of books? (source: Google Ngram Viewer )