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