little owl vs owlet

little owl

noun

  • A species of small European owl, Athene noctua. 

owlet

noun

  • One of a species of small owls, such as Athene noctua. 

  • A young owl; owling. 

  • An owlet moth. 

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