Dictionary of Human Evolution and Biology

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Simias Miller, 1903

Monotypic catarrhine genus to which the simakobu langur belongs. Some authorities include this species as a subspecies of Nasalis larvatus. Inhabits primary forests in the Mentawi Islands (near Sumatra). Arboreal, but will come to the ground to flee when threatened; diurnal; arboreal quadrupeds. Body mass ranges from 7 to 9 kg. Dental formula:; folivorous. Short tail. Live in monogamous social groups of around four individuals; not known to vocalize to any extent. Natural history poorly known and considered endangered.

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