Relict gull or Central Asian gull (Mòng bể relic, Ichthyaetus relictus)

The relict gull or Central Asian gull (Ichthyaetus relictus) is a medium-sized gull.

The birds breeds in Mongolia, in Kazakhstan, in Russia, and in China (Lake Hongjiannao).
This species is migratory and can be found in South Korea and China during the non-breeding period.

Charadriiformes, 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").

Laridae is a scientific taxonomic family name for gulls, terns, and skimmers, originating from the New Latin Larus (gull or seabird) combined with the suffix -idae (indicating a zoological family). The root Larus is derived from the Ancient Greek word λάρος (laros), which referred to a ravenous seabird or gull. 

The genus name is from Ancient Greek ikhthus, "fish", and aetos, "eagle".  The name refers to the fish-eating habits of these birds. They were previously included in the genus Larus.

Relictus is a Latin adjective and past participle of relinquere (to leave behind), meaning abandoned, forsaken, left behind, or deserted. It is derived from the Proto-Indo-European root leikw- ("to leave"), related to Greek leipein.