Spoon-billed sandpiper 
(Rẽ mỏ thìa, Calidris pygmaea)

Spoon-billed sandpiper (Rẽ mỏ thìa, Calidris pygmeus, Calidris pygmaea), a critically threatened species, is a small wader which breeds in north-eastern Russia and winters in Southeast Asia. 

The bird is frequently sighted birds at the Xuan Thuy National Park in winter.

Charadriidae, Charadrius: Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate; from Ancient Greek kharadrios a bird found in ravines and river valleys (kharadra, "ravine").

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 Calidris is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds.

Pygmaea comes from Greek pygmaîos (πυγμαῖος) and Latin pygmaeus, meaning "dwarfish," "undersized," or "fist-sized," derived from pygmē (πυγή) meaning "fist" or a measure of forearm length (elbow to knuckle). It's used in scientific names to denote something very small. Latin adoption is pygmaeus (dwarf, dwarfish).