Any of several usually white herons of the genera Bubulcus, Casmerodius, Egretta, and related genera, characteristically having long, showy, drooping plumes during the breeding season.

• 白鹭一种牛背鹭，casmerodius，大白鹭属及与其相关的鹭属的白鹭，羽毛多为白色，繁殖季节时长有美丽的下垂的长羽毛