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Chlidonias, often known as the marsh terns, is a genus of birds in family Laridae. 
The birds are found in freshwater marshes, rather than coastal locations. 
The genus name Chlidonias is from Ancient Greek khelidonios, "swallow-like", from khelidon, "swallow".

1/ Whiskered tern (Nhàn đen, Chlidonias hybrida)
The specific hybridus is Latin for hybrid.

2/ White-winged tern, or white-winged black tern (Nhàn xám, Chlidonias leucopterus or Chlidonias leucoptera)

White-winged tern, or white-winged black tern 
(Nhàn xám, Chlidonias leucopterus or Chlidonias leucoptera)

The whiskered tern (Chlidonias hybrida) is a tern in the family Laridae.
The populations in tropical regions are resident, but European and Asian birds winter south to Africa and the Indian subcontinent.

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 Chlidonias is from Ancient Greek khelidonios, "swallow-like", from khelidon, "swallow".

Hybrida is a Latin noun meaning "mongrel" "mixed blood", often applied to children of mixed social or racial background. 
The term is associated with the Ancient Greek word hybris (ὕβρις, húbris), meaning "outrage" or "unnatural act" suggesting a hybrid was historically viewed as a violation of nature.

White-winged tern, or white-winged black tern 
(Nhàn xám, Chlidonias leucopterus or Chlidonias leucoptera)

The white-winged tern or white-winged black tern (Chlidonias leucopterus) is a species of tern in the family Laridae.
This bird is found in or near bodies of fresh water across much of the world, including Europe, Africa, Asia, and Australia.

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 Chlidonias is from Ancient Greek khelidonios, "swallow-like", from khelidon, "swallow".

Leucoptera is derived from Ancient Greek meaning "white-winged": the Greek words leukos ("white") and pteron ("wing" or "feather").