partridge vs tinamou

partridge

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

tinamou

noun
  • Any of the birds belonging to the South American family Tinamidae, the only family in the order Tinamiformes. They are related to the ratites, together with which they form the superorder Paleognathae. 

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