go the way of the dodo vs quail

go the way of the dodo

verb
  • To go extinct or become obsolete; to fall out of common practice or use; to become a thing of the past. 

quail

verb
  • To waste away; to fade, to wither. 

  • Of courage, faith, etc.: to slacken, to give way. 

  • To lose heart or courage; to be daunted or fearful. 

noun
  • The meat from this bird eaten as food. 

  • Any of various small game birds of the genera Coturnix, Anurophasis or Perdicula in the Old World family Phasianidae or of the New World family Odontophoridae. 

How often have the words go the way of the dodo and quail occurred in a corpus of books? (source: Google Ngram Viewer )