Pectoral sandpiper 
(Calidris melanotos, Choắt ngực đốm), often abbreviated pec

The pectoral sandpiper (Calidris melanotos) is a small, migratory wader of the family Charadriidae.
This bird species breeds in arctic regions of North America and Asia, wintering in South America and Oceania.

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.
The specific melanotos is from Greek melas, "black" and notos, "backed": black-backed.