egret vs western cattle egret

egret

noun
  • Any of various wading birds of the genera Egretta or Ardea that includes herons, many of which are white or buff, and several of which develop fine plumes during the breeding season. 

  • A plume or tuft of feathers worn as a part of a headdress, or anything imitating such an ornament. 

  • The flying feathery or hairy crown of seeds or achenes, such as the down of the thistle. 

western cattle egret

noun
  • Bubulcus ibis is a species of heron (family Ardeidae) found in the tropics, subtropics and warm temperate zones. 

How often have the words egret and western cattle egret occurred in a corpus of books? (source: Google Ngram Viewer )