Hartert's leaf warbler 
(Phylloscopus goodsoni)

Hartert's leaf warbler (Phylloscopus goodsoni) is a leaf warbler of the family Phylloscopidae.

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").