Pin-tailed snipe or pintail snipe (Rẽ giun Á châu, Gallinago stenura)

The pin-tailed snipe or pintail snipe (Gallinago stenura) is a species of bird in the family Scolopacidae, the sandpipers.
The bird breeds in northern Russia and migrates to spend the non-breeding season in southern Asia from Pakistan to Indonesia. 
This bird species is the most common migrant snipe in southern India, Sri Lanka and much of Southeast Asia. 

The term Charadriiformes comes from New Latin, combining the Greek word kharadrios ("a bird of river valleys" or "a bird of ravines") and the Latin suffix -formes meaning "forms" or "shaped like". Therefore, Charadriiformes translates to "birds shaped like or resembling the charadrius," which is a type of plover or stone curlew historically found in dry river beds or ravines. 

The word Scolopacidae is New Latin, derived from the genus name Scolopax (Latin for "snipe" or "woodcock") and the common zoological suffix for family names, -idae.

The genus name gallinago is Neo-Latin for a woodcock or snipe from Latin gallina, "hen" and the suffix -ago, "resembling".

stenura: From Ancient Greek στενός (stenós, “narrow”); -ouros -tailed.