Q. With respect to the Western Hoolock Gibbons, which of the following statements is/are correct?
1. A Sanctuary in North-east India is home to this ape species listed as Endangered in the International Union for Conservation of Nature (IUCN) Red List.
2. They have specialized brachiation and can easily swing between trees.
3. They possess a strong and heavy build like gorillas, yet are remarkably agile tree climbers.
Select the answer using the code given below:
(a) 1 only
(b) 1 and 2
(c) 2 and 3
(d) 3 only

Answer : B

Explanation:

Statement I is correct: Hollongapar Gibbon Sanctuary in Assam is home to Western Hoolock Gibbon, listed as Endangered on the IUCN Red List.
Statement II is correct: They have long forelimbs specialised for brachiation (swinging between trees).
Statement III is not correct: Hoolock gibbons are small/light-bodied apes (around 6 kg), not heavy like gorillas. They are agile arboreal apes, not "tree climbers" in the gorilla sense.

Source:
https://www.wwfindia.org/about_wwf/priority_species/lesser_known_species/hoolock_gibbons_/