WordNet sense 1 (a common egret of the genus Egretta found in America; it is a variety of the Old World white egret Casmerodius albus):

American egret, Egretta albus

WordNet sense 2 (widely distributed Old World white egret):

Casmerodius albus

WordNet sense 3 (large white heron of Florida and the Florida Keys):

Ardea occidentalis