excreta vs guano

excreta

noun
  • Bodily waste which is excreted from the body. 

guano

noun
  • Dung from a sea bird or from a bat. 

  • Coccothrinax borhidiana, a variety of palm tree indigenous to Cuba. 

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