Hollongapar Gibbon Sanctuary:
Scientists suggested rerouting the railway track running through the Hollongapar Gibbon Sanctuary.
- Hollongapar Gibbon Sanctuary was renamed on 25 May 2004, formerly known as the Gibbon Wildlife Sanctuary or Hollongapar Reserve Forest.
- It is an isolated protected area of evergreen forest located in the Jorhat district of Assam.
- The upper canopy of the forest is dominated by the Hollong tree, while the Nahar dominates the middle canopy. The lower canopy consists of evergreen shrubs and herbs.
- The sanctuary has a rich biodiversity and is home to the only apes in India, the western Hoolock, as well as the only nocturnal primate found in the northeast Indian states, the Bengal slow loris.
- Also it is home to Stump-tailed macaque, northern pig-tailed macaque, eastern Assamese macaque, rhesus macaque, and capped langur etc