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Topic 228 · Environment, Climate & Biodiversity

Hoolock gibbon uses railway canopy bridge

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Revise the 12 points first Book 1 RATNA

Core Trigger: On 15 May 2026 a western hoolock gibbon crossed a rope canopy bridge over the Lumding–Dibrugarh railway in Hollongapar Sanctuary, Assam.
Milestone: WII called it the first confirmed gibbon use of the bridges and the first documented use over a railway anywhere.
Current Head: Minister Bhupender Yadav shared the video on 15 May 2026, calling it 'tech-led conservation'.
Design: The rope bridges have safety nets below and were designed by WII with Assam Forest Department and Northeast Frontier Railway.
Data / Report: The western hoolock is IUCN Endangered; the eastern hoolock is Vulnerable; both assessments date from 12 September 2017.
Stakeholders: Aaranyak, a Guwahati NGO, built a natural canopy bridge in 2019; the Chindwin separates the two hoolock species.
India Link: Hoolock gibbons are India's only apes; the western hoolock occurs across seven north-eastern States.
Headquarters: The Wildlife Institute of India, a MoEFCC body, is based in Dehradun.
Founded: The railway line dates from 1887; the bridges were installed in early 2025 during electrification.
Landmark: The Wild Life (Protection) Amendment Act, 2022 (Act 18 of 2022) was assented on 19 December 2022.
Statute: Hoolock Gibbon (Hoolock hoolock) is entry 129 in Schedule I, Part A (Mammals), of the Wild Life (Protection) Act, 1972.
Definition: Brachiation is arm-over-arm swinging through branches; fragmentation splits continuous habitat.

Question 1 of 10

In which Assam sanctuary did a western hoolock gibbon use a rope canopy bridge on 15 May 2026?

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Answer: (B) Hollongapar Sanctuary

Core Trigger: On 15 May 2026 a western hoolock gibbon crossed a rope canopy bridge over the Lumding–Dibrugarh railway in Hollongapar Sanctuary, Assam.From Book 1 RATNA, topic 228, point 1

Question 2 of 10

WII called it the first documented use of a canopy bridge over what, anywhere?

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Answer: (D) A railway line

Milestone: WII called it the first confirmed gibbon use of the bridges and the first documented use over a railway anywhere.From Book 1 RATNA, topic 228, point 2

Question 3 of 10

Who shared the video on 15 May 2026, calling it 'tech-led conservation'?

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Answer: (C) Bhupender Yadav

Current Head: Minister Bhupender Yadav shared the video on 15 May 2026, calling it 'tech-led conservation'.From Book 1 RATNA, topic 228, point 3

Question 4 of 10

The rope bridges were designed by WII, the Assam Forest Department and which railway zone?

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Answer: (A) Northeast Frontier Railway

Design: The rope bridges have safety nets below and were designed by WII with Assam Forest Department and Northeast Frontier Railway.From Book 1 RATNA, topic 228, point 4

Question 5 of 10

The western hoolock is classed by IUCN as what?

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Answer: (C) Endangered

Data / Report: The western hoolock is IUCN Endangered; the eastern hoolock is Vulnerable; both assessments date from 12 September 2017.From Book 1 RATNA, topic 228, point 5

Question 6 of 10

Consider: 1) Aaranyak, a Guwahati NGO, built a natural canopy bridge in 2019. 2) The Brahmaputra separates the two hoolock species. Which is/are correct?

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Answer: (A) Only 1

Stakeholders: Aaranyak, a Guwahati NGO, built a natural canopy bridge in 2019; the Chindwin separates the two hoolock species.From Book 1 RATNA, topic 228, point 6

Question 7 of 10

The Wildlife Institute of India is based in which city?

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Answer: (C) Dehradun

Headquarters: The Wildlife Institute of India, a MoEFCC body, is based in Dehradun.From Book 1 RATNA, topic 228, point 8

Question 8 of 10

The railway line crossed by the bridges dates from which year?

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Answer: (B) 1887

Founded: The railway line dates from 1887; the bridges were installed in early 2025 during electrification.From Book 1 RATNA, topic 228, point 9

Question 9 of 10

The Wild Life (Protection) Amendment Act, 2022 was assented on which date?

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Answer: (B) 19 December 2022

Landmark: The Wild Life (Protection) Amendment Act, 2022 (Act 18 of 2022) was assented on 19 December 2022.From Book 1 RATNA, topic 228, point 10

Question 10 of 10

Consider: 1) The hoolock gibbon is entry 129 in Schedule I, Part A (Mammals), of the Wild Life (Protection) Act, 1972. 2) Brachiation is arm-over-arm swinging through branches. Which is/are correct?

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Answer: (C) Both 1 and 2

Statute: Hoolock Gibbon (Hoolock hoolock) is entry 129 in Schedule I, Part A (Mammals), of the Wild Life (Protection) Act, 1972.From Book 1 RATNA, topic 228, point 11

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