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A coucal is one of about 30 species of birds in the cuckoo family. All of them belong in the subfamily Centropodinae and the genus Centropus. 
The genus name combines the Ancient Greek: kentron meaning "spur" or "spike", pous meaning "foot".

1/ Greater coucal or crow pheasant (Bìm bịp lớn, Centropus sinensis)
2/ Lesser coucal (Bìm bịp nhỏ, Centropus bengalensis) 

Greater coucal 
or crow pheasant 
(Bìm bịp lớn, Centropus sinensis)

The greater coucal or crow pheasant (Centropus sinensis), is a large non-parasitic member of the cuckoo order of birds, the Cuculiformes. 
The bird is a widespread resident in the Indian Subcontinent and Southeast Asia.

Compare:
- The greater coucal or crow pheasant (Centropus sinensis): red-eyed, big-sized;
- The lesser coucal (Centropus bengalensis): black-eyed, medium-sized;

Cuculus: Latin for cuckoo.
The genus Centropus name combines the Ancient Greek: kentron meaning "spur" or "spike", pous meaning "foot".

Hierococcyx or hawk-cuckoos is a genus of birds in the family Cuculidae. The resemblance to hawks gives this group the generic name of hawk-cuckoos.
The genus is sometimes included in the genus Cuculus.

1/ Large hawk-cuckoo (Chèo chẹo lớn, Hierococcyx sparverioides)
previously assigned as Cuculus sparverioides
2/ Malaysian hawk-cuckoo or Malay hawk-cuckoo (Bìm bịp nhỏ, Hierococcyx fugax)
previously assigned as Cuculus fugax

Lesser coucal 
(Bìm bịp nhỏ, Centropus bengalensis) 

The lesser coucal (Centropus bengalensis) is a species of cuckoo in the family Cuculidae.
The species is widely distributed west from the Indian subcontinent (except for Sri Lanka) extending east across Southeast Asia. 

Compare:
- The greater coucal or crow pheasant (Centropus sinensis): red-eyed, big-sized;
- The lesser coucal (Centropus bengalensis): black-eyed, medium-sized;

Cuculus: Latin for cuckoo.
The genus Centropus name combines the Ancient Greek: kentron meaning "spur" or "spike", pous meaning "foot".