common buzzard vs kestrel

common buzzard

noun
  • A bird of prey species, Buteo buteo. 

kestrel

noun
  • Any of various small falcons of the genus Falco that hover while hunting. 

  • The common kestrel, Falco tinnunculus. 

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