Green-backed flycatcher 
(Ficedula elisae)

The green-backed flycatcher (Ficedula elisae) is a bird in the family Muscicapidae, the Old World flycatchers.
The bird breeds in northeastern China and winters in southeast Asia.

Ficedula is a genus of passerine birds in the family Muscicapidae.
The genus name is from Latin and refers to a small fig-eating bird (ficus, "fig") supposed to change into the blackcap in winter.