The pet trade and traditional medicine also increase demand for illegal hunting.
But the population has been declining since 1982, most likely due to illegal hunting.
Mostly, deer are the target of illegal hunting in the area.
A small amount of illegal hunting occurs at drinking sites.
Another potential threat to the reserve is illegal hunting within the reserve's land.
It is rather surprising, that even with all the illegal hunting and after a long war, there are still new species being discovered in Vietnam.
Game wardens say they have never before seen so much illegal hunting.
The boy who had almost become a victim of illegal hunting.
The species is nonetheless close to extinction in the wild, as illegal hunting seems to continue.
Some species are highly vulnerable to illegal hunting, or poaching.