The Sarawak surili (Presbytis chrysomelas) is a species of primate in the Cercopithecidae family. It is endemic to the southeast Asian island of Borneo, where it is distributed north of the Kapuas River in Kalimantan, Indonesia, the Malaysia states of Sarawak and Sabah, and in Brunei. Its taxonomy is complex and disputed, and it has been considered a subspecies of P. femoralis or P. melalophos. The Sarawak Surili was formerly considered common, but has declined drastically...