Large-billed leaf warbler 
(Phylloscopus magnirostris)

The large-billed leaf warbler (Phylloscopus magnirostris) is a species of migratory leaf warbler (family Phylloscopidae) found in Asia.

Leaf warblers were formerly included in the Old World warbler family but are now considered to belong to the family Phylloscopidae.
The name Phylloscopus (Phylloscopidae) combines the Ancient Greek phullon meaning "leaf" and skopos meaning "seeker" (from skopeo, "to watch").
Magnirostris is Latin, combining magnus ("great" or "large") and -rostris (from rostrum, meaning "beak" or "bill"), essentially translating to "large-billed".