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Photo: Mark Spence (iNaturalist) · CC BY 4.0 (May be cropped or resized)
Presbytis siberu
Range
Siberut Island, Mentawai Islands
The Siberut langur (Presbytis siberu) lives only on Siberut Island in the Mentawai group. It was formerly treated as a subspecies of the Mentawai langur but is now recognised as a separate species; the Mentawai langur proper occurs on Sipora and the Pagai islands (Wikipedia, general species account).