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Photo: svetlanarussia (iNaturalist) · CC0 1.0
Presbytis bicolor
Range
Sumatra
The bicoloured (black-and-white) surili, Presbytis bicolor, was formerly treated as a subspecies of the Sumatran surili, P. melalophos, and is now recognised as a separate species on Sumatra. It is poorly known and is listed as Data Deficient (Wikipedia, general species account).