Lesser crested tern (Nhàn mào nhỏ, Thalasseus bengalensis)

The lesser crested tern (Thalasseus bengalensis) is a tern in the family Laridae.
The bird breeds in subtropical coastal parts of the world mainly from the Red Sea across the Indian Ocean to the western Pacific, and Australia.
Most populations of this species are migratory. 

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 generic name Thalasseus is derived from the Ancient Greek Thalassa meaning "sea". The term reflects the coastal, sea-fishing habitat of these birds.

The specific epithet bengalensis means "of Bengal", the type locality, historically referring to Bangladesh and part of Northeast India.