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Photo: Matt Muir (iNaturalist) · CC BY 4.0 (May be cropped or resized)
Presbytis mitrata
Range
Southern Sumatra
The mitred langur (Presbytis mitrata) was formerly treated as a subspecies of the Sumatran surili, P. melalophos, and is now recognised as a separate species. It lives in southern Sumatra (Wikipedia, general species account).