dung beetle vs scarab

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. 

scarab

noun
  • Any species of beetle belonging to the family Scarabaeidae. 

  • A beetle of the species Scarabaeus sacer, sacred to the ancient Egyptians. 

  • A symbol, seal, amulet, or gem fashioned to resemble the sacred beetle. 

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