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:

QUESTION

Medium

Environment & Ecology

Prelims 2026

With respect to the Western Hoolock Gibbons, which of the following statements is/are correct?

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.
They have specialized brachiation and can easily swing between trees.
They possess a strong and heavy build like gorillas, yet are remarkably agile tree climbers.

Select the answer using the code given below:

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Explanation

Statement 1 is Correct: The Western Hoolock Gibbon is native to North-east India, and the Hollongapar Gibbon Sanctuary in Assam is a prominent protected area specifically dedicated to this species. Furthermore, the Western Hoolock Gibbon is classified as Endangered on the IUCN Red List.

Statement 2 is Correct: They are highly arboreal canopy-dwellers. They move primarily through brachiation—a specialized mode of locomotion where they use their exceptionally long arms to swing swiftly and effortlessly from tree branch to tree branch.

Statement 3 is Incorrect: Gibbons are classified as "lesser apes" (family Hylobatidae). Unlike "great apes" such as gorillas which possess massive, heavy builds, Hoolock gibbons are small, slender, and lightweight. Adults typically weigh only 6 to 9 kg, a physical adaptation that is essential for their remarkable aerial agility in the forest canopy.

Therefore, option B is the correct answer.

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