American kestrel vs Eurasian sparrowhawk

American kestrel

noun

  • Any of a species of small falcon, Falco sparverius; a kestrel. 

Eurasian sparrowhawk

noun

  • A bird of the species Accipiter nisus 

How often have the words American kestrel and Eurasian sparrowhawk occurred in a corpus of books? (source: Google Ngram Viewer )