Eastern Hoolock Gibbon

Kingdom Order Family Genus Species
Animalia Primates Hylobatidae Hoolock Hoolock leuconedys
Eastern Hoolock Gibbon
IUCN Status: Vulnerable
  • Common Name: Eastern Hoolock Gibbon
  • Taxonomy Classification Year: 1967
  • Monkey Size: 60 to 90 cm (23.6 to 35.4 in)
  • Skin Color(s): Black or gray-brown
  • Habitat: Rainforest
  • Diet: Omnivorous
  • Native Countries: China

Eastern Hoolock Gibbon Distribution

Eastern Hoolock Gibbon Characteristics

The eastern hoolock gibbon[1] is a primate of the Hylobatidae family. Eastern hoolock gibbons don’t have a tail like all other monkeys but have a patch of hair in the anogenital region.

  • They have long arms and relatively long legs with elongated hooked hands and opposable thumbs not used for tree swinging.
  • The sexes are around the same size but differ significantly in coloration: males are black or blackish, with a white stripe across the eyes.
  • Females are lighter in color, ranging from pale and tawny to grey-brown, darker on the neck and chest.
  • Both sport black faces. White rings encircling the eyes and mouth of females give their face a mask-like appearance.

Eastern Hoolock Gibbon Facts

Eastern Hoolock Gibbon

  • Like all gibbons, eastern hoolocks have a ball joint that forms the wrist, connecting the hand to the forearm, and an adaptation that makes branchiation (swinging from one branch to another with their arms) much easier.
  • Hollocks are the second largest gibbons after siamangs. They reach a height of 60-90 centimeters and weigh 6-9 kilograms.
  • They are usually densely clustered in trees, concentrating on the tallest trees in the canopy and tending to choose hilltop or sloping sites.
  • The species are more active in summer, waking up earlier than in winter, socializing more if they awake 8 to 10 hours daily, and sleeping just before nightfall.
  • This species’ main threat is habitat loss and destruction due to human activities such as mining, logging, agriculture, and construction.

Suggested Reading: Various Apes

Cite This Page

BioExplorer.net. (2023, March 24). Eastern Hoolock Gibbon. Bio Explorer. https://www.bioexplorer.net/animals/mammals/apes/eastern-hoolock-gibbon/.
BioExplorer.net. "Eastern Hoolock Gibbon" Bio Explorer, 24 March 2023, https://www.bioexplorer.net/animals/mammals/apes/eastern-hoolock-gibbon/.
BioExplorer.net. "Eastern Hoolock Gibbon" Bio Explorer, March 24 2023. https://www.bioexplorer.net/animals/mammals/apes/eastern-hoolock-gibbon/.
Key References
  • [1]“Eastern Hoolock Gibbon | People Resources and Conservation Foundation”. Accessed October 20, 2022. Link.


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