painted bunting vs red-backed shrike

painted bunting

noun
  • A brightly-colored finch (Passerina ciris) of the southern United States 

  • Smith's longspur (Calcarius pictus). 

red-backed shrike

noun
  • A medium-sized bird (Lanius collurio) of the shrike family that breeds in most of Europe and western Asia and winters in tropical Africa, eating large insects, small birds, voles, and lizards. 

How often have the words painted bunting and red-backed shrike occurred in a corpus of books? (source: Google Ngram Viewer )