guinea fowl vs partridge

guinea fowl

noun
  • Any of several African birds of the family Numididae (6 species) resembling partridges. 

partridge

noun
  • Any bird of a number of genera in the family Phasianidae, notably in the genera Perdix and Alectoris. 

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