silvered langur, T. selangorensis. Roos et al. also elevated the West Javan Langur, Trachypithecus mauritius, and Annamese Langur, Trachypithecus margarita, to species status (formerly subspecies of T. auratus and T. germaini, respectively). In 2020, Roos et al. discovered a new species, Popa langur (T. popa), which is found only in Myanmar. This leaves the current understanding of the genus Trachypithecus to be: Trachypithecus cristatus group East Javan langur, Trachypithecus auratus West Javan langur, Trachypithecus mauritius Silvery lutung or silvered leaf monkey, Trachypithecus cristatus Selangor silvered langur, Trachypithecus selangorensis Germain's langur, Trachypithecus germaini Annamese langur, Trachypithecus margarita Tenasserim lutung, Trachypithecus barbei Trachypithecus obscurus group Indochinese grey langur, Trachypithecus crepusculus Dusky leaf monkey, Trachypithecus obscurus Phayre's leaf monkey, Trachypithecus phayrei Popa langur, Trachypithecus popa Shan State langur, Trachypithecus melamera Trachypithecus pileatus group Capped langur, Trachypithecus pileatus Shortridge's langur, Trachypithecus shortridgei Gee's golden langur, Trachypithecus geei Trachypithecus francoisi group Francois' langur, Trachypithecus francoisi Hatinh langur, Trachypithecus hatinhensis Cat Ba langur, Trachypithecus poliocephalus White-headed langur, Trachypithecus leucocephalus Laotian langur, Trachypithecus laotum Delacour's langur, Trachypithecus delacouri Indochinese black langur, Trachypithecus ebenus Physical description Lutungs have a rather slim build with a long tail. The fur color varies, depending on the species, from black and grey to orange yellow. Many species have skin designs and a brighter lower surface, the hair on the head is often compared to a hood. Their arms are very short in comparison to the feet and their thumbs are also somewhat shorter. The inner surfaces of the hands and feet are hairless so that their fur does not get caught when reaching into branches. These animals reach a length of 40 to 80 cm and a weight of 5 to 15 kg, with males generally larger than females. A bulge over the eyes and other details, primarily in the head, differentiate it from the surilis. Habitat and distribution Lutungs live in the forests, often preferring rain forests, although occasionally they are also found in secluded mountain forests. Lutungs are found in South-east Asia and parts of South Asia from India in the west to China in the east. Behaviour They spend the largest part of the day in the trees, where they crawl along the branches on all fours, although they can also jump well from tree to tree. They are diurnal, although more active in the early mornings and the afternoon. They live in groups of five to 20 animals,