Delacour's Langur

Delacour's langur, or Delacour's lutung, is a species of Old World monkey endemic to northern Vietnam, named for the French-American ornithologist Jean Theodore Delacour. It is somewhat larger than its closest relatives, Francois' langur and the Laotian langur. The fur is predominantly black with white markings on the face and distinctive creamy-white fur over the rump and outer thighs; females also have a pale pubic patch. It has a crest of long, upright hair over the forehead and crown (Wikipedia, general species account).

It is found only in an area of about 6,000 km² in and around Hanoi and in Ninh Binh, Ha Nam, Hoa Binh and Thanh Hoa provinces. The largest surviving population is thought to be in Van Long Nature Reserve, Ninh Binh. Langurs are diurnal and often sleep on open rock surfaces or in limestone caves; groups were once reported of up to 30 animals but are now typically four to 16. Females bear a single orange-furred young after 170–200 days, and the coat turns black from about four months.