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Common cuckoo 
(Cu cu, Cuculus canorus)

The cuckoo, common cuckoo, European cuckoo or Eurasian cuckoo (Cuculus canorus) is a member of the cuckoo order of birds, Cuculiformes.
This bird species is a widespread summer migrant to Europe and Asia, and winters in Africa.

The English word "cuckoo" comes from the Old French cucu.
The genus name Cuculus is the Latin word for "cuckoo".
canorum, canorus Latin canorus melodious ( from canere, meaning to sing).

Cuculus is a genus of cuckoos which has representatives in most of the Old World with the greatest diversity in tropical southern and southeastern Asia. The genus name is the Latin word for "cuckoo".

1/ Indian cuckoo ( Bắt cô trói cột, Cuculus micropterus)
2/ Common cuckoo ( Cu cu, Cuculus canorus)
3/ Lesser cuckoo ( Cu cu nhỏ, Cuculus poliocephalus) 
4/ Himalayan cuckoo (Cu cu Himalaya, Cuculus saturatus)
5/ Oriental cuckoo or Horsfields cuckoo (Cu cu phương đông, Cuculus optatus), formerly classified as a subspecies of the Himalayan cuckoo (Cuculus saturatus)

Himalayan cuckoo 
(Cu cu Himalaya, Cuculus saturatus)

Cuculus saturatus, better well known as the Himalayan cuckoo or Oriental cuckoo, is a brooding parasitic bird that is part of the Cuculidae family. 
The species breeds from the Himalayas eastward to southern China and Taiwan. It migrates to southeast Asia and the Greater Sunda Islands for the winter.

The genus name Cuculus is the Latin word for "cuckoo".
saturata Latin saturatus richly coloured (satur, satura rich, copious > satis enough).

Indian cuckoo 
( Bắt cô trói cột, Cuculus micropterus)

The Indian cuckoo or short-winged cuckoo (Cuculus micropterus) is a member of the cuckoo order of birds, the Cuculiformes.
The bird is found in the Indian subcontinent and Southeast Asia.

The genus name Cuculus is the Latin word for "cuckoo".
micropterum, Micropterus, micropterus Greek mikroptera small-winged.

Lesser cuckoo 
( Cu cu nhỏ, Cuculus poliocephalus) 

The lesser cuckoo (Cuculus poliocephalus) is a species of cuckoo in the family Cuculidae.
This bird is found in Bangladesh, Bhutan, China, Democratic Republic of the Congo, Hong Kong, India, Japan, Kenya, North Korea, South Korea, Laos, Malawi, Myanmar, Nepal, Pakistan, Russia, Seychelles, Somalia, South Africa, Sri Lanka, Tanzania, Thailand, Vietnam, Zambia, and Zimbabwe.

The genus name Cuculus is the Latin word for "cuckoo".
poliocephalus: poliocephalus Greek polios grey; -kephalos -headed.

Oriental cuckoo 
or Horsfields cuckoo 
(Cu cu phương đông, Cuculus optatus), formerly classified as a subspecies of the Himalayan cuckoo (Cuculus saturatus)

The Oriental cuckoo or Horsfields cuckoo (Cuculus optatus) is a bird belonging to the genus Cuculus in the cuckoo family Cuculidae.

The genus name Cuculus is the Latin word for "cuckoo".
optata, optatus Latin optatus welcome, wished for (optare to choose, to desire).