hedge sparrow vs house sparrow

hedge sparrow

noun
  • Former name for the bird Prunella modularis, the dunnock. 

house sparrow

noun
  • A bird of the species Passer domesticus, native to much of Eurasia, introduced in many other temperate environments. 

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