scops owl vs snowy owl

scops owl

noun
  • A small European migratory owl, Otus scops, that winters in sub-Saharran Africa. 

  • Any owl of the Old World genus Otus. 

snowy owl

noun
  • A large, white, nomadic Arctic owl, Bubo scandiacus. 

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