Ardea is a genus of herons. The genus name comes from the Latin word ardea meaning "heron".

1/ Great egret (Ardea alba), also known as the common egret, large egret, or (in the Old World) great white egret or great white heron
2/ Intermediate egret, median egret, smaller egret or medium egret (Cò ngàng nhỏ, Ardea intermedia)
Some authorities classify the intermediate egret in its own monotypic genus, Mesophoyx, while others place it with the smaller egrets in Egretta.
3/ Purple heron (Diệc lửa, Ardea purpurea) 
4/ Great-billed heron (Diệc Sumatra, Ardea sumatrana)
5/ Grey heron (Diệc xám, Ardea cinerea)