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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

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.