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The cattle egret (Bubulcus) is a cosmopolitan genus of heron (family Ardeidae) found in the tropics, subtropics, and warm-temperate zones.

The below two species have been moved to the genus Ardea. There is no more bird species in the genus Bubulcus

The genus contains two species: the western cattle egret and the eastern cattle egret. Some authorities regard them as a single species. 

1/ Western cattle egret (Cò ruồi, Bubulcus ibis)

2/ Eastern cattle egret (Cò ruồi, Bubulcus coromandus)

The genus name Bubulcus is Latin for herdsman, referring to this species' association with cattle. 

Eastern cattle egret (Ardea coromanda)
Formerly belonging to the genus Bubulcus:  Eastern cattle egret (Cò ruồi, Bubulcus coromandus)
The epithet coromanda refers to the Coromandel Coast of India.

The eastern cattle egret (Ardea coromanda) is a species of heron (family Ardeidae) found in the tropics, subtropics and warm temperate zones. 

Ardeidae, Ardea: the Latin word ardea meaning "heron".
The genus name Bubulcus is Latin for herdsman, referring to this species' association with cattle. 
"Coromandus, coromanda" is a Latinized name derived from the geographical name for the Coromandel Coast in southeastern India.

Western cattle egret (Ardea ibis)
Formerly belonging to the genus Bubulcus.

The western cattle egret (Ardea ibis) is a species of heron (family Ardeidae) found in the tropics, subtropics and warm temperate zones.
The bird was originally native to parts of Asia, Africa and Europe; nowadays its distribution has expanded to much of the rest of the world.

The genus name comes from the Latin word ardea meaning "heron".
The word "ibis" comes from the Latin and Ancient Greek word for this group of long-legged birds. While Latin gives us the direct word "ibis," it is originally derived from the Ancient Greek word îbis, which in turn came from the Egyptian word hbj. Therefore, in Latin, the meaning is directly "ibis," while in Greek, it is the same word îbis which refers to the bird.