Glossy ibis 
(Quắm đen, Plegadis falcinellus)

The glossy ibis (Plegadis falcinellus) is a water bird in the order Pelecaniformes and the ibis and spoonbill 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.

Plegadis: from Ancient Greek plegados meaning "sickle", referring to the distinctive shape of the bill.
falcinellus: Latin falx, falcis sickle, referring to the distinctive shape of the bill.