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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)

Great egret 
(Cò ngàng lớn, Ardea alba), also known as the common egret, large egret, or (in the Old World) great white egret or great white heron

The great egret (Ardea alba) is a bird species of the heron family Ardeidae.
This bird species is distributed across most of the tropical and warmer temperate regions of the world

Ardea is a genus of herons. The genus name comes from the Latin word ardea meaning "heron".
The scientific name comes from Latin ardea for "heron", and alba for "white".
formerly placed in Egretta genus.

Grey heron (Diệc xám, Ardea cinerea)

The grey heron (Ardea cinerea) is a long-legged wading bird of the heron family, Ardeidae, native throughout temperate Europe and Asia, and also parts of Africa.

Ardea is a genus of herons. The genus name comes from the Latin word ardea meaning "heron".
Cinerea is a Latin word meaning "ash-like," "ash-colored," or "grayish".

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.

The medium egret (Ardea intermedia), median egret, smaller egret or intermediate egret, is a medium-sized heron.

The genus name comes from the Latin word ardea meaning "heron".