Editing Red-shanked douc (section)

==Locomotion==
[[File:Semnopithecus_nemaeus_-_1700-1880_-_Print_-_Iconographia_Zoologica_-_Special_Collections_University_of_Amsterdam_-_UBA01_IZ19900033.tif|thumb|Red-shanked douc moving in a tree]]

In captivity, red-shanked doucs use [[brachiation]] for almost half of their locomotion whereas, in the wild, arm-swinging accounts for an average of 18% of locomotion. Juveniles use arm-swinging the most (34.3%), followed by subadults (21.7%), adult females (17.6%), adult females carrying infants (15.5%), and then adult males (9.8%). This showed that with increased body weight there is a decreased amount of brachiation.<ref>{{Cite journal |last1=Bailey |first1=Katie E. |last2=Winking |first2=Jeffrey W. |last3=Carlson |first3=David L. |last4=Tran Van Bang |last5=Ha Thang Long |date=1 August 2020 |title=Arm-Swinging in the Red-Shanked Douc (''Pygathrix nemaeus'': Implications of Body Mass |url=https://doi.org/10.1007/s10764-020-00163-6 |journal=International Journal of Primatology |language=en |volume=41 |issue=4 |pages=583–595 |doi=10.1007/s10764-020-00163-6 |s2cid=220461111 |issn=1573-8604|url-access=subscription }}</ref>

When they travel by foot, their tail will usually hang down.<ref>{{Cite journal |last=Stevens, N. J., Wright, K. A., Covert, H. H., & Nadler, T. |date=2008 |title=ail postures of four quadrupedal leaf monkeys (Pygathrix nemaeus, P. cinerea, Trachypithecus delacouri and T. hatinhensis) at the Endangered Primate Rescue Center, Cuc Phuong National Park, Vietnam |url=http://dev.eprc.asia/wp-content/uploads/2019/06/VietnameseJournalofPrimatology-1.2.pdf#page=15 |journal=Vietnamese Journal of Primatology 1 |volume=2}}</ref> Like all other Old World monkeys, its tail is not [[prehensile]]. It uses its tail solely for balance, and it uses its arms and legs to move through the forest along established routes.{{Citation needed|date=April 2022}} When on the move, the group is led by adult males, with juvenile males bringing up the rear and the females and infants staying safe in the middle.{{Citation needed|date=April 2022}} This douc is an aerial specialist, moving high up in the canopy. It is very agile and frequently makes breath-taking leaps of up to 6 meters (20 feet), leaping with its arms outstretched over its head, pushing off with its legs and landing on two feet.{{Citation needed|date=April 2022}}

When the group is untroubled, the red-shanked douc will move noisily from branch to branch through the forest, crashing through foliage, swinging under branches and leaping with two feet together, displaying its remarkable sense of balance. But when a group is disturbed, by either a predator or other dangers, it can flee silently through the trees, away from danger. If it is startled, it may produce loud barks and rush around the trees slapping branches with its hands and feet.{{Citation needed|date=April 2022}}