Mekong Wagtail
(Motacilla samveasnae)

The Mekong wagtail (Motacilla samveasnae) is a species of bird in the family Motacillidae.
The bird is found in the Mekong valley of Cambodia and Laos, and is a non-breeding visitor to Thailand and Vietnam.

Passeriformes, Passerina, passerina: Latin passerinus sparrow-like, (i.e. sparrow-sized) (passer sparrow).
Motacillidae, Motacilla: From Latin motacilla (“wagtail”), the word is a diminutive of motare, "to move about".