“Nest Characteristics of the Sumatran Orang-Utan (Pongo Abelii) in the Wildlife Sanctuary Soraya Station in Aceh Province, Indonesia”. Tropical Life Sciences Research 32, no. 3 (September 30, 2021): 161–178. Accessed December 23, 2024. https://ejournal.usm.my/tlsr/article/view/tlsr_vol32-no-3-2021_9.