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Black-headed woodpecker 
(Gõ kiến xanh hông đỏ, Picus erythropygius)

The black-headed woodpecker (Picus erythropygius) is a species of bird in the family Picidae. 
The bird is found in Cambodia, Laos, Myanmar, Thailand, and Vietnam, in deciduous and coniferous forests.

picidae, picus: woodpecker
erythropygius
 Erythro: eruthros meaning "red"
 -pugios -rumped (puge: rump).

Gray-Headed Woodpecker 
also known as the grey-faced woodpecker.
(Gõ kiến xanh gáy đen, Picus canus).

The grey-headed woodpecker (Picus canus), also known as the grey-faced woodpecker, is a Eurasian member of the woodpecker family, Picidae. 

picidae, picus: woodpecker.
The specific epithet canus is the Latin for "grey".

Laced woodpecker 
(Gõ kiến xanh bụng vàng, Picus vittatus)

The laced woodpecker (Picus vittatus) is a species of bird in the family Picidae.

The bird is found throughout Southeast Asia in the countries of Cambodia, China, Indonesia, Laos, Malaysia, Myanmar, Singapore, Thailand and Vietnam.

Piciformes, picidae, picus: woodpecker.
vittata, vittatum, vittatus: Latin vittatus banded.

Lesser Yellownape
(Gõ kiến xanh cánh đỏ, Picus chlorolophus)

The lesser yellownape (Picus chlorolophus) is a type of woodpecker which is a widespread and often common breeder in tropical and sub-tropical Asia, primarily the Indian subcontinent and Southeast Asia.

picidae, picus: woodpecker.
Chloris (/ˈklɔːrɪs/; Greek Χλωρίς Chlōrís, from χλωρός chlōrós, meaning "greenish-yellow";(khloros χλωρός green or yellow.
lophos: Greek -crest.
chlorolophus: yellow crest.

Picus is a genus of birds in the woodpecker family. It has representatives in Europe, Asia and North Africa.

picidae, picus: woodpecker.

1/ Streak-throated woodpecker (Gõ kiến xanh bụng vằn, Picus xanthopygaeus)
2/ Laced woodpecker (Gõ kiến xanh bụng vàng, Picus vittatus)
3/ Lesser yellownape (Gõ kiến xanh cánh đỏ, Picus chlorolophus)
4/ Red-collared woodpecker (Gõ kiến xanh cổ đỏ, Picus rabieri)
5/ Grey-headed woodpecker (Gõ kiến xanh gáy đen, Picus canus), also known as the grey-faced woodpecker
6/ Black-headed woodpecker (Gõ kiến xanh hông đỏ, Picus erythropygius)

Red-Collared Woodpecker
(Gõ kiến xanh cổ đỏ, Picus rabieri)

The red-collared woodpecker (Picus rabieri), which is found in Cambodia, China, Laos, and Vietnam, is a species of bird in the family Picidae.

picidae, picus: woodpecker.bi

Streak-throated woodpecker 
(Gõ kiến xanh bụng vằn, Picus xanthopygaeus)

The streak-throated woodpecker (Picus xanthopygaeus) is a species of woodpecker found in the Indian subcontinent.

picidae, picus: woodpecker
xanthopygaeus:
 xanthos,-E,-on, yellow of various shades, golden or pale yellow; also red-yellow, chestnut, auburn
 pygaeus Greek -pugios -rumped (puge: rump).