Alström's warbler (Phylloscopus soror), or the plain-tailed warbler
Chim chích Alström, Chích đớp ruồi đuôi phẳng

Alström's warbler (Phylloscopus soror), or the plain-tailed warbler, is a species of Old World warbler in the family Phylloscopidae. 
It breeds only in China and winters as far as Thailand, Laos, Cambodia 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").
soror is Latin for "sister" (that is "closely related").