dung beetle vs green fruit beetle

dung beetle

noun
  • Any of the true dung beetles of subfamily Scarabaeinae. 

  • Any of the beetle of the family Scarabaeidae (scarab beetles), especially of the subfamilies Scarabaeinae and Aphodiinae, noted for rolling dung into balls for use as food or as brooding chambers. 

green fruit beetle

noun
  • A beetle (Cotinis mutabilis) that ranges from central Texas across the southwestern United States and Mexico and feeds on cactus, desert trees, and cultivated fruit. 

How often have the words dung beetle and green fruit beetle occurred in a corpus of books? (source: Google Ngram Viewer )