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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".

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