Truong Son Muntjac or Annamite Muntjac (Muntiacus truongsonensis) is a species of muntjac

Muntjac

Muntjac, also known as Barking Deer and Mastreani Deer, are small deer of the genus Muntiacus. Muntjac are the oldest known deer, appearing 15–35 million years ago, with remains found in Miocene deposits in France, Germany and Poland....

 deer

Deer

Deer are the ruminant mammals forming the family Cervidae. Species in the Cervidae family include white-tailed deer, elk, moose, red deer, reindeer, fallow deer, roe deer and chital. Male deer of all species and female reindeer grow and shed new antlers each year...

. It is one of the smallest muntjac species, at about 15 kg, half the size of the Indian Muntjac

Indian Muntjac

The Common Muntjac , also called the Red Muntjac, Indian Muntjac or Barking deer is the most numerous muntjac deer species. It has soft, short, brownish or greyish hair, sometimes with creamy markings. This species is omnivorous, feeding on fruits, shoots, seeds, birds' eggs as well as small...

 (or Common Muntjac). It was discovered in the Truong Son

Trường Sơn

Trường Sơn is a commune and village in Lục Nam District, Bac Giang Province, in northeastern Vietnam.-References:...

 mountain range in Vietnam

Vietnam

Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...

in 1997.

It was identified by examination of skulls and descriptions provided by villagers, who call it samsoi cacoong, or "the deer that lives in the deep, thick forest." It lives at altitudes of 400-1000 metres, where its small size allows it to move through dense undergrowth.