1. Tropical Biodiversity Conservation Program, Department of Forest Resources Conservation and Ecotourism, Faculty of Forestry and Environment, IPB University (Bogor Agricultural University), Bogor, Indonesia
2. Department of Forest Resources Conservation and Ecotourism, Faculty of Forestry and Environment, IPB University (Bogor Agricultural University), Bogor, Indonesia
3. Department of Geophysics and Meteorology, Faculty of Mathematics and Natural Sciences, IPB University (Bogor Agricultural University), Bogor, Indonesia
4. Primate Research Center, IPB University (Bogor Agricultural University), Bogor, Indonesia