Eastern Gray Gibbon

Kingdom Order Family Genus Species
Animalia Primates Hylobatidae Hylobates Hylobates funereus
East Bornean Gray Gibbon
IUCN Status: Endangered
  • Common Names: East Bornean Gray Gibbon, Northern Gray Gibbon
  • Taxonomy Classification Year: 1850
  • Monkey Size: 44 to 64 cm (17 to 25 in)
  • Skin Color(s): Light brown
  • Habitat: Forest, rainforest
  • Diet: Herbivorous
  • Native Countries: Borneo

East Bornean Gray Gibbon Distribution

Eastern Gray Gibbon Characteristics

The eastern gray gibbon[2], also known as the northern gray gibbon, is a primate in the gibbon family, Hylobatidae.

  • Eastern gray gibbons have light brown fur that fades to black on the face, chest, and inner arms, with a white border around the face.
  • They have padded buttocks and pronounced canines, and the base of the thumb starts at the wrist rather than the palm of the hand, allowing them a wide range of motion.
  • However, this limits their ability to grasp small objects. Like all the great apes, these gibbons do not have a tail.
  • Instead, among their most distinctive features are their very long arms, especially the elongated ulna and radial bones of the forearms.
  • This trait, along with many other small skeletal changes, tailors the species to its method of movement: brachiation.

Eastern Gray Gibbon Facts

Eastern Gray Gibbon F

  • Eastern gray gibbons are among the fastest non-flying arboreal mammals in the world, reaching speeds of up to 56 km/h (35 mph).
  • They are so adapted to brachiation that when they run through the trees, they bring their legs close to their bodies to avoid getting in the way.
  • On the rare occasions that these arboreal monkeys descend to the ground, they hold their hands above their heads for balance and to prevent their hands from dragging along the ground when walking on two legs.
  • These gibbons spend little time socializing: only about 5 percent of their day is spent grooming and playing socially, which is relatively little for a primate species.
  • As with the other two gray gibbon species, the eastern gray gibbon is endangered due to heavy deforestation in Borneo and increased wildfires exacerbated by El Niño events.

Suggested Reading: All Types of Apes

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BioExplorer.net. (2022, December 07). Eastern Gray Gibbon. Bio Explorer. https://www.bioexplorer.net/animals/mammals/apes/eastern-gray-gibbon/.
BioExplorer.net. "Eastern Gray Gibbon" Bio Explorer, 07 December 2022, https://www.bioexplorer.net/animals/mammals/apes/eastern-gray-gibbon/.
BioExplorer.net. "Eastern Gray Gibbon" Bio Explorer, December 07 2022. https://www.bioexplorer.net/animals/mammals/apes/eastern-gray-gibbon/.
Key References
  • [1]“File:Hylobates funereus North Borneo Gibbon Tabin WR Sabah Quentin Phillipps 23 Oct 2010.jpg – Wikimedia Commons”. Accessed October 19, 2022. Link.
  • [2]“127RAFFLES BULLETIN OF ZOOLOGY 2016 Activity budget, travel distance, sleeping time, height of activity and travel order of wild East Bornean Grey gibbons (Hylobates funereus) in Danum Valley Conservation Area”. Accessed October 19, 2022. Link.

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