Work

Extralimital urban movement of a Golden Langur Trachypithecus geei (Khajuria, 1956) in Nalbari District, Assam, India

Year: 2026

Type: article

Abstract: The Golden Langur Trachypithecus geei is an endangered colobine primate endemic to a narrow transboundary belt of western Assam, India, and southern Bhutan, bounded by the Manas and Sankosh rivers and the Brahmaputra. Between 8 August 2025 and 18 January 2026, a solitary adult male was recorded during 12 observations across four locations-Dahudi, Tihu, Gamarimuri (Kaithalkuchi), and Nalbari Town-all urban and peri-urban settlements in Nalbari District that lie well outside the species’ known distribution, before reportedly continuing its movement further east. The animal used isolated Peepal Ficus religiosa trees, Atha Dimoru Ficus auriculata, Rain Tree Samanea saman, bamboo clumps, and other roadside and homestead vegetation as isolated patches while traversing the human-dominated matrix. We document these observations as an unusual extralimital excursion by a single dispersing individual, not as evidence of a new or expanding distribution range, and discuss probable causes, welfare risks (electrocution, vehicular traffic, and free-ranging dogs), and implications for conservation in human-dominated landscapes of the Brahmaputra floodplain.

Source: Journal of Threatened Taxa

DOI: 10.11609/jott.10794.18.10.29916-29920

Authors: Bhaskarjyoti Dutta, Jonmani Kalita, Parimal Chandra Ray, Bidyut Kumar Das

Institutions: The Assam Royal Global University, Nalbari College

Language: English

Topic: Primate Behavior and Ecology

Subfield: Social Psychology

Field: Psychology

Domain: Social Sciences

SDG: Life on land

Open Access status: gold

Estimated APC paid: $600