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.