The snakes on the Hoàng Liên Sơn range lie all the way. They did not even run away when people approached.
The 'poisonous snake forest ' area is a large valley, located between two majestic rock ranges, one with Putaleng peak, one with Ta Lien Son peak, towering. In that valley most are wild boars, chamois, footprints. The birds pull the chirping songs on the tree. But, the most still is poisonous snakes.
The snake in this forest has few enemies, the humans do not hunt ever, so they are not afraid of people. These snakes are so brave that the stone throwing and throwing will not crawl, keep poking their heads up and looking at people like strange creatures.