Two-barred Warbler 
(Chích hai vạch, Phylloscopus plumbeitarsus)

The two-barred warbler (Phylloscopus plumbeitarsus) is a bird of the leaf warbler family (Phylloscopidae). 
The bird is closely related to the greenish warbler, to which it was formerly considered conspecific.
This species is found in northern Mongolia, Manchuria and southern Siberia.

Leaf warblers are small insectivorous passerine birds belonging to the genus Phylloscopus. 
Leaf warblers were formerly included in the Old World warbler family but are now considered to belong to the family Phylloscopidae, introduced in 2006.
The name Phylloscopus combines the Ancient Greek phullon meaning "leaf" and skopos meaning "seeker" (from skopeo, "to watch").

plumbeitarsus Latin plumbeus plumbeous; Greek tarsos flat of the foot.
"Tarsos" can refer to the ankle or the bones of the ankle in anatomy. It can also refer to the corresponding part of the foot in other animals, or the tarsal plate of the eyelid. In a zoological context, "tarsos" can also denote the distal part of an arthropod's limb.