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Bangladesh-Wintering Redshanks Used a Narrower Himalayan Corridor Than Singapore Birds

Common Redshank in flight over water in Kerala, India
Research · Ecology

Nine Common Redshanks (Tringa totanus) tracked from non-breeding grounds in southern Bangladesh crossed the Himalayas toward breeding areas in Qinghai and Siberia. Their routes were then compared with previously tracked Common Redshanks wintering in Singapore, revealing a striking combination of shared mountain passage and different endpoints.

The findings were first publicly highlighted by Wader Study on 1 July 2026. The full research paper was published in the journal on 1 September 2026. The study addresses a major gap in knowledge about Common Redshank migration in the Central Asian Flyway, particularly for birds wintering in Bangladesh.

The Bangladesh birds used a much narrower mountain corridor

The Bangladesh-wintering birds followed a narrow trans-Himalayan corridor spanning about 4.7 degrees of longitude. The Singapore comparison group had used a corridor of about 13 degrees—roughly three times as wide. The Bangladesh group also had a shorter mean migration distance.

The comparison is important because both groups crossed the same major geographical barrier. The expectation was that birds facing the Himalayas might converge on similar low-cost passage routes even if they wintered far apart. The tracking data supported shared use of a broad trans-Himalayan pathway, but the Bangladesh birds were concentrated into a much narrower longitudinal corridor.

Similar passage did not lead to the same breeding destinations

Shared use of the mountain passage did not translate into clear overlap in breeding areas. Even among birds that reached the Qinghai–Tibetan Plateau, the two wintering groups showed no clear common breeding range.

Three of the nine Bangladesh-wintering individuals bred outside the previously known breeding distribution described for the species in the region. Two did so in Qinghai, China, and one reached Khakassia in Russia. These tracks extend the documented breeding connectivity of birds wintering in Bangladesh and show that a single non-breeding population can link southern Asian wetlands with widely separated breeding regions.

The same flyway can connect different wintering and breeding areas

The study illustrates why a flyway should not be treated as one uniform migration route. Birds can pass through the same broad mountain corridor while connecting different non-breeding and breeding areas. The Bangladesh and Singapore redshanks therefore shared part of the migration system without forming one geographically identical migration strategy.

The sample was small — nine tracked birds from Bangladesh — so the routes do not define the full migration pattern of all redshanks wintering there. Tracking studies are also inherently shaped by which tagged individuals provide usable movement data. The results nevertheless add direct movement evidence from a region where Common Redshank migration has been poorly documented.

Inland wetlands along the Central Asian Flyway remain poorly known

The authors highlight the Central Asian Flyway, including the Qinghai–Tibetan Plateau, as a priority for further tracking and wetland research. Much shorebird research in Asia has concentrated on coastal migration systems, while species such as Common Redshank can leave coastal non-breeding areas and make long overland movements through inland wetlands and across high mountain ranges.

For conservation, the central result is one of connectivity: protecting a wintering site alone does not capture the full annual cycle of these birds. Bangladesh-wintering redshanks depended on a narrow passage across the Himalayas and breeding areas in China and Russia, while the Singapore comparison birds used related passage routes but different destinations. Understanding those links is necessary before the most important inland stopover and breeding areas can be identified consistently across the flyway.

Sources and image credit

  1. Nowell, A. G., Chowdhury, S. U., Foysal, M., Khan, N. U., Qiu, W., Li, D., Lu, X., & Choi, C.-Y. (2026). A shared Himalayan route, but distinct origins and destinations: Common Redshank migration in the Central Asian Flyway. Wader Study, 133(2), 109–116.Primary research article published 1 September 2026. Nine Common Redshanks caught during the non-breeding season in southern Bangladesh were tracked across the Himalayas to breeding grounds in Qinghai and Siberia and compared with previously tracked birds wintering in Singapore. Bangladesh-wintering birds used a narrower migration corridor (4.72 ± 1.19 degrees of longitude versus 12.97 ± 3.45 for the Singapore group) and a shorter mean migration distance; three bred outside the previously known breeding range.
  2. Buehler, D. M. (2026). Spotlight: Redshanks overcoming mountains. Wader Study.Public journal Spotlight published 1 July 2026 highlighting the Nowell et al. redshank migration study before the full research article appeared. This is the earliest verified public journal release of the study findings and therefore the Wildlife Vagabond story date.

Image: Shino Jacob Koottanad — Common Redshank in flight at Chavakkad, Thrissur, Kerala, India, 18 September 2022; Wikimedia Commons; CC BY-SA 4.0. Uncropped representative image from the South Asian migration region, not one of the tracked birds. · CC BY-SA 4.0 · Source

About this content: This story was produced with AI assistance within an editorial workflow developed by Wildlife Vagabond. Editorial responsibility remains with Wildlife Vagabond.How AI is used

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