Erithacus rubecola vs robin redbreast

Erithacus rubecola

robin redbreast

noun

  • Any robin. 

  • A Bow Street Runner (from the colour of his waistcoat). 

  • The European robin. 

How often have the words Erithacus rubecola and robin redbreast occurred in a corpus of books? (source: Google Ngram Viewer )