The Siberut Langur[1] (Presbytis siberu) is a monkey species in the Cercopithecidae family.
- It was previously thought to be a subspecies of the Mentawai langur, Presbytis potenziani (like Presbytis potenziani siberu). Still, genetic analysis has shown them to be separate species.
- Siberut langur infants are born with white coats. After 2 to 3 weeks, the coat begins darkening, and the face takes on a dark pigmentation.
- This color change begins at the dorsal midline and head and ends laterally.
- After 3 months, the belly and chest are dark reddish brown, the cheeks, throat, forehead, and tip of the tail are white, and the rest of the body is jet black. Males are distinguished from females by a patch of white fur around the genital area.
- Sibirut langurs have slender bodies with hind legs that are longer than their forelegs.
