Population status of Francois’ Langur (Trachypithecus francoisi) at Ba Be National Park

The Francois’ Langur (Trachypithecus francoisi) is an endangered primate belonging to subfamily Colobinae. The species was historically widespread in seven northern provinces of Viet Nam. Ba Be National Park is located in Vietnam’s northern mountains, and is a home to several small groups of T. francoisi. The objective of these surveys is to reveal distribution, group size and threats to species and its habitats.