praying mantis vs vermin

praying mantis

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

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

  • A mantid of the species Mantis religiosa. 

vermin

noun
  • Any one of various common types of small insects or animals which cause harm and annoyance. 

  • Animals that prey on game, such as foxes or weasels. 

  • Obnoxious, or mean and offensive person or people. 

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