Supplementary material 1 from: Van Phung K, Van Tran D, Thanh Dong H, Quang Luu V, Bac Bui V, Tien Vu T (2023) Changes in suitable habitat for the critically endangered Northern white-cheeked gibbon (Nomascus leucogenys) in the Western Nghe An Biosphere Reserve, Vietnam: Implication for conservation. Nature Conservation 51: 167-188. https://doi.org/10.3897/natureconservation.51.90373