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The Pelecanidae is a family of pelecaniform birds within the Pelecani that contains three genera: 
- the extinct Eopelecanus,
- the Miopelecanus,
- and the extant Pelecanus.

Pelecaniformes, Pelecanidae, Pelecanus
 Pelecanus: Greek pelekan, pelekanos pelican.
 Greek pelekan (πελεκάν), meaning "pelican" or related to "axe" (pelekys).
 From pelekys (πέλεκυς), meaning "axe," likely due to the shape of the bill.

Pelicans (genus Pelecanus) are a genus of large water birds that make up the family Pelecanidae with a long beak and a large throat pouch.
The throat pouch is used for catching prey and draining water from the scooped-up contents before swallowing. 

1/ Great white pelican (Bồ nông trắng lớn, Pelecanus onocrotalus) also known as the eastern white pelican, rosy pelican or simply white pelican
2/ Spot-billed pelican (Bồ nông chân xám, Pelecanus philippensis) or gray pelican 

Pelecaniformes, Pelecanidae, Pelecanus
 Pelecanus: Greek pelekan, pelekanos pelican.
 Greek pelekan (πελεκάν), meaning "pelican" or related to "axe" (pelekys).
 From pelekys (πέλεκυς), meaning "axe," likely due to the shape of the bill.