aigrette vs grey heron

aigrette

noun
  • The lesser white heron. 

  • A feather or plume, or feather-shaped item, used as an adornment or ornament. 

  • The feathery crown of some seeds (such as the dandelion). 

grey heron

noun
  • Ardea cinerea, an Old World wading bird of the heron family. 

How often have the words aigrette and grey heron occurred in a corpus of books? (source: Google Ngram Viewer )