The doucs or douc langurs make up the genusPygathrix, which belongs to the subfamilyColobinae (leaf-eating monkeys). There are 3 members of this genus:
Red-shanked Douc, Pygathrix nemaeus
Black-shanked Douc, Pygathrix nigripe
Gray-shanked Douc, Pygathrix cinerea
These colobine Old World monkeys have an extremely striking appearance. The Red-shanked Douc characteristically has bright maroon legs and reddish patches around the eyes. In contrast, the Grey-shanked Douc is less vibrant, with speckled grey legs and orange markings on the face. Both have dappled grey bodies, black hands and feet and white cheeks, although the cheek hairs of the Red-shanked Douc are much longer. The Black-shanked Douc has black legs. Their long hind limbs and tail allow these monkeys to be wonderfully agile in their treetop habitat.
Even though they are known as "douc langurs", they are in fact more closely related to the Proboscis Monkey and snub-nosed monkeys, than to any of the langurs. They are part of the Colobinae subfamily of the Cercopithecidae family.
Pygathrix roxellana roxellana: The dorsal pelage of this subspecies is dull golden-red (Wang et al.
Pygathrix roxellana hubeiensis: The dorsal pelage of this subspecies is pale golden-reddish (Wang et al.
Pygathrix roxellana roxellana: This subspecies is found in western Sichuan and southern Gansu, from the Dadu River in the east to the Sichuan Basin in the west (Wang et al.
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