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leaf-eating monkey found only on the Mentawai Islands west of Sumatra. The body averages about half a metre (20 inches) in length, and it is unique among langurs in having a tail that is much shorter than the body (15 cm [6 inches]). Females weigh 7 kg (15.5 pounds) on average, and males are somewhat larger. Apart from the piglike tail, the most outstanding feature is the fairly prominent and upturned nose. Most simakobu are blackish, but a significant proportion (one-quarter to one- third) of them are creamy buff in colour