Pin-Tailed Green Pigeon 
( Cu xanh đuôi nhọn, Treron apicauda) 

The pin-tailed green pigeon or pin-tailed pigeon (Treron apicauda) is a species of bird in the family Columbidae native to Southeast Asia.
The pin-tailed green pigeon is found in Bangladesh, Bhutan, Cambodia, China, India, Laos, Myanmar, Nepal, Thailand, and Vietnam. 

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".
The specific epithet apicauda: Latin apex, apicis point, apex; cauda tail.