Ecologica Montenegrina, 61, 2023, 16-30 New ecological information on the little-known Sumatran endemics Black-and-white langur Presbytis bicolor Aimi & Bakar, 1992 (Primates: Cercopithecidae) MUHAMMAD IQBAL 1,2 , NUR RACHMAN 3 , EGA OKTAVIANUS PUTRA 4 , TOHAR NAINGGOLAN 5 , MUHAMMMAD BASROWI 6 , AJI SARTONO 1 , IRVAN NURMANSYAH 7 , RANDI SYAFUTRA 8 , WILSON NOVARINO 9 , SYAFRUDDIN PERWIRA NEGARA 10 , ARIF RUDIYANTO 11 , ARUM SETIAWAN 12 & INDRA YUSTIAN 12* 1 Daemeter Consulting, Jalan Tangkuban Perahu No. 1, Bogor, West Java 16128, Indonesia. E-mail: aji.sartono@daemeter.org; https://orcid.org/0000-0002-3312-3862 2 Biology Program, Faculty of Science, Sriwijaya University, Jalan Padang Selasa 524, Palembang, South Sumatra 30139, Indonesia. E-mail: kpbsos26@yahoo.com; https://orcid.org/0000-0002-6657-0183 3 Yayasan Konservasi Khatulistiwa, Jalan Untung Suropati No. 15, Perum Griya Tepian Lestari, Kalimantan Timur, Indonesia. E-mail: ornithologi95@gmail.com; https://orcid.org/0000-0002-9482-1103 4 Jambi Birding, Jalan Lintas Jambi-Muara Bulian KM 17, Sungai Duren, Muaro Jambi, Indonesia. E-mail: egaoktavianusputraputra@gmail.com; https://orcid.org/0000-0001-8111-682X 5 PT Brahma Binabakti, Jalan Lintas Timur km 54, Suko Awin Jaya, Muaro Jambi, Jambi 36381, Indonesia. E-mail: tohargoland@gmail.com; https://orcid.org/0000-0002-1475-6197 6 Department of Biology, Faculty of Mathematics and Natural Sciences, IPB University, Jalan Raya Darmaga, Bogor 16680, West Java, Indonesia. E-mail: basrowi07@gmail.com; https://orcid.org/0000-0003-4711-0541 7 PT Triputra Agro Persada Tbk, The East Building Lantai 23, Kuningan Timur, Jakarta 12950, Indonesia. E-mail: irvan.nurmansyah@tap-agri.com; https://orcid.org/0000-0003-3879-3934 8 Department of Natural Resources Conservation, Faculty of Engineering and Science, Muhammadiyah University of Bangka Belitung, Bangka Belitung 33684, Indonesia. E-mail: randi.syafutra@unmuhbabel.ac.id; https://orcid.org/0000-0001-8156-0613 9 Department of Biology, Faculty of Science, Andalas University, Kampus Limau Manis, Limau Manis 25163, West Sumatra, Indonesia. E-mail: wilson_n_id@yahoo.com; https://orcid.org/0000-0003-4189-7750 10 Bukit Tiga Puluh National Park, Rantau Langsat, Batang Gangsal, Indragiri Hulu Regency, Riau 29355, Indonesia. E-mail: udinocu@gmail.com; https://orcid.org/0000-0002-2266-6204 11 Yayasan Kanopi Indonesia, Jalan Candi Winangun, Gang Randu I, Sleman, Yogyakarta 55581, Indonesia. E-mail: arif.rudiyanto@gmail.com; https://orcid.org/0000-0002-1793-9116 12 Department of Biology, Faculty of Science, Sriwijaya University, Jalan Raya Palembang-Prabumulih km 32, Indralaya, South Sumatra, Indonesia. E-mail: arum.setiawan@unsri.ac.id; https://orcid.org/0000-0001-6024-1090 * Corresponding Author. E-mail: idr_yustian@unsri.ac.id; https://orcid.org/0000-0002-7226-078X Received 10 December 2022 │ Accepted by V. Pešić: 31 January 2023 │ Published online 3 February 2023. Ecologica Montenegrina 61: 16-30 (2023) This journal is available online at: www.biotaxa.org/em https://dx.doi.org/10.37828/em.2023.61.3