Pygathrix or doucs and douc langurs is a genus of Old World monkeys of the subfamily Colobinae. These colobine Old World monkeys, native to Southeast Asia, have an extremely striking appearance. The red-shanked douc characteristically has bright maroon legs and reddish patches around the eyes. In contrast, the gray-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 very agile in their treetop habitat.