Leach's kingfisher vs blue-winged kookaburra

Leach's kingfisher

blue-winged kookaburra

noun

  • A species of kookaburra, Dacelo leachii, of northern Australia and New Guinea. 

How often have the words Leach's kingfisher and blue-winged kookaburra occurred in a corpus of books? (source: Google Ngram Viewer )