Bianchi's warbler (Phylloscopus valentini)

Bianchi's warbler (Phylloscopus valentini) is a species of leaf warbler (family Phylloscopidae). 
This species was formerly included in the "Old World warbler" assemblage.
The bird is found in China, Laos, Myanmar, and Vietnam.

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").