The limestone massif surrounded by towering cliffs swamps is ideal terrain for secure survival of the species of Langurs. However, the research to conserve this rare langur species still is in place by pressing there are many threats to the survival of Delacour. To date there have been a number of surveys on the distribution and status of this species is largely set in the wild, and some research on the food and Habitat of Langurs in captivity. To have more information for the conservation of Delacour, we conduct the subject of thesis: "study of the biological characteristics, ecological Trachypithecus delacouri (Delacour Osgood, 1932) at the Van Long nature reserve and proposed a number of solutions of conservation ".
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