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Western Hoolock Gibbon

May 17, 2026

In a first, a male Western Hoolock Gibbon housed in the Hollongapar Gibbon Sanctuary in Assam's Jorhat district crossed the canopy bridges installed over a railway line passing through the sanctuary.

About Western Hoolock Gibbon:

  • It is the smallest and fastest of all apes.
  • Habitat: It is found in a range of forest types, from moist deciduous to evergreen, sub-tropical to lowland.
  • Distribution: It is found in all the states of the north-east, restricted between the south of the Brahmaputra river and east of the Dibang river. Outside India, it is found in Bangladesh and Myanmar.
  • Characteristics of Western Hoolock Gibbon:
    • They are diurnal and arboreal, brachiating through the trees with their long arms.
    • They are monogamous (same partner throughout life).
    • They live in small families and communicate with other gibbons by vocalisation.
    • Life span: 25 years.
  • Threats: Habitat destruction illegal logging presented the greatest threat.
  • Conservation Status
    • IUCN: Endangered
    • Wildlife (Protection) Act of India, 1972: Schedule I

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