go the way of the Dodo vs go the way of the dodo

go the way of the Dodo

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.

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