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The bird genus Pseudibis consists of three South-East Asian species in the ibis subfamily, Threskiornithinae.

1/ Red-naped ibis (Cò quăm cánh xanh or Cò quăm đen Ấn Độ or cò quăm gáy đỏ, Pseudibis papillosa) also known as the Indian black ibis or black ibis
2/ Giant ibis (Cò quăm lớn, Pseudibis gigantea)

Threskiornis is a genus of ibises, wading birds of the family Threskiornithidae.

1/ Black-headed ibis (Cò quăm đầu đen, Threskiornis melanocephalus), also known as the Oriental white ibis, Indian white ibis, and black-necked ibis

Spoonbills are a genus, Platalea, of large, long-legged wading birds. 

Pelecanus: Greek pelekan, pelekanos pelican.

Threskiornis Greek threskeia religious worship (threskeuo to worship); ornis bird. 
The Sacred Ibis Threskiornis aethiopicus was venerated by the ancient Egyptians for its crescent-shaped bill and bright white plumage. They considered it to represent Thoth the moon god.

Platalea: from Ancient Greek and meaning "broad", referring to the shape of the bill.

1/ Black-faced spoonbill (Cò thìa, Platalea minor)
2/ Eurasian spoonbill (Cò thìa Á Âu, Platalea leucorodia), or common spoonbill
leucorodia is from Ancient Greek leukerodios: leukos, "white" and erodios "heron".

Plegadis is a bird genus in the family Threskiornithidae. 

Pelecanus: Greek pelekan, pelekanos pelican.

Threskiornis Greek threskeia religious worship (threskeuo to worship); ornis bird. 
The Sacred Ibis Threskiornis aethiopicus was venerated by the ancient Egyptians for its crescent-shaped bill and bright white plumage. They considered it to represent Thoth the moon god.

The genus name derives from Ancient Greek plegados meaning "sickle", referring to the distinctive shape of the bill.

1/ Glossy ibis (Quắm đen, Plegadis falcinellus)
The scientific name derives from Ancient Greek plegados and Latin, falcis, both meaning "sickle", referring to the distinctive shape of the bill.

The family Threskiornithidae, which belongs to the bird order Pelecaniformes, includes 36 species of large wading birds. 

Pelecanus: Greek pelekan, pelekanos pelican.

Threskiornis Greek threskeia religious worship (threskeuo to worship); ornis bird. 
The Sacred Ibis Threskiornis aethiopicus was venerated by the ancient Egyptians for its crescent-shaped bill and bright white plumage. They considered it to represent Thoth the moon god.