Yellow-Vented Green Pigeon 
(Cu xanh Seimun, Treron seimundi)

The yellow-vented green pigeon (Treron seimundi), also known as Seimunds's Pintail Pigeon, is a species of bird in the family Columbidae.

Columbidae, Columba: Latin columba (“dove, pigeon”). Ancient Greek κόλυμβος (kólumbos, “a diver”), from κολυμβάω (kolumbáō, “dive, plunge headlong, swim”).
Pigeon is a French word that derives from the Latin pīpiō, for a "peeping" chick;
Dove is an ultimately Germanic word that refers to the bird's diving flight.
The genus name Treron is from the Ancient Greek trērōn meaning "pigeon" or "dove".