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The Terek Sandpiper (Xenus cinereus, Choắt chân màng bé) is a small migratory wader species, family of Scolopacidae, genus Xenus. Terek Sandpiper is a pass-through winter bird commonly sighted at the Xuan Thuy National Park.

Xenus is a genus of waders containing only one member, Terek sandpiper (Xenus cinereus).

1/ Terek sandpiper (Choắt chân màng bé, Xenus cinereus) 
It is named after the Terek River which flows into the west of the Caspian Sea where it was first observed.
The genus name Xenus is from Ancient Greek xenos meaning "stranger"; the specific epithet cinereus is Latin for "ash-grey" from cinis, cineris, "ashes".