pack rat vs vulture

pack rat

noun
  • One who collects or hoards, especially unnecessary things. 

  • Any of several small North American rodents, of the genus Neotoma, that have bushy tails. 

vulture

noun
  • A person who profits from the suffering of others. 

  • Any of several carrion-eating birds of the families Accipitridae and Cathartidae. 

verb
  • To circle around one's target as if one were a vulture. 

How often have the words pack rat and vulture occurred in a corpus of books? (source: Google Ngram Viewer )