Black-bellied tern (Nhàn bụng đen, Sterna acuticauda)

The black-bellied tern (Sterna acuticauda) is a tern found near large rivers in the Indian subcontinent.
The distribution range is from from Pakistan, Nepal and India to Myanmar.

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:from Ancient Greek laros or Latin larus, which appears to have referred to a gull or other large seabird.

The genus name Sterna is derived from Old English "stearn", "tern".

Acuticauda is a Latin-derived term meaning "pointy-tailed" or "sharp-tailed". It combines the Latin words acutus (pointed/sharp) and cauda (tail).