"Egrets in their rookeries white as candles among the moss"
Great Egret (Ardea alba) nest at Morro Bay Heron Rookery, California
Creative Commons AttributionGreat Egret (Ardea alba) nest at Morro Bay Heron Rookery, California - Credit: Mike Baird

An egret is any one of several herons, most of which are white or buff, and several of which develop fine plumes (usually milky white) during the breeding season.