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Chestnut-Vented Nuthatch 
(Trèo cây đít hung, Sitta nagaensis)

The chestnut-vented nuthatch is a species of bird in the nuthatch family Sittidae of the order Passeriformes.

Sittidae and Sitta derived from sitte, Ancient Greek for this bird.
The species name is composed of naga and the Latin suffix -ensis, "that lives in, that inhabits," was given in reference to the area when the type of the species was collected, the Naga Hills.

The genus Sitta comprise the nuthatches which are small passerine birds belonging to the family Sittidae.

1/ Indian nuthatch (Trèo cây bụng hung, Sitta castanea)
From Ancient Greek kastáneia, from kástana meaning chestnut or chestnut tree.
This species has been split by Rasmussen and Anderton (2005) from the chestnut-bellied nuthatch.

2/ Chestnut-vented nuthatch (Trèo cây đít hung, Sitta nagaensis)
 The species name is composed of naga and the Latin suffix -ensis, "that lives in, that inhabits," was given in reference to the area when the type of the species was collected, the Naga Hills.

3/ White-tailed nuthatch (Trèo cây Himalaya, Sitta himalayensis)

4/ Beautiful nuthatch (Trèo cây lưng đen, Sitta formosa)
The name derives from the Latin name Formosus and Spanish word "fermoso", meaning "beautiful".

5/ Yellow-billed nuthatch (Trèo cây mỏ vàng, Sitta solangiae)

6/ Velvet-fronted nuthatch (Trèo cây trán đen, Sitta frontalis)
Latin word meaning "frontal" (= relating to the forehead).

Velvet-Fronted Nuthatch 
(Trèo cây trán đen, Sitta frontalis)

The velvet-fronted nuthatch (Sitta frontalis) is a small passerine bird in the nuthatch family Sittidae.

The term nuthatch refers to the propensity of some species to wedge a large insect or seed in a crack and hack at it with their strong bills.
Sitta, a name derived from sitte, Ancient Greek for the nuthatch bird.
Latin word meaning "frontal" (= relating to the forehead).

Yellow-Billed Nuthatch 
(Trèo cây mỏ vàng, Sitta solangiae)

The yellow-billed nuthatch (Sitta solangiae), found in Hainan, Laos, and Vietnam, is a species of bird in the family Sittidae.

The term nuthatch refers to the propensity of some species to wedge a large insect or seed in a crack and hack at it with their strong bills.
Sitta, a name derived from sitte, Ancient Greek for the nuthatch bird.
Latin word meaning "frontal" (= relating to the forehead).