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Location India, Arunachal Pradesh
Central coordinates 95o 30.00' East  27o 13.00' North
IBA criteria A1, A2
Area 8,000 ha
Altitude 120 - 400m
Year of IBA assessment 2004

Bombay Natural History Society

Site description This large Tropical Wet Evergreen Forest area is little explored by scientists. It lies adjacent to Assam’s Upper Dihing (West Block) and Joypur Reserve Forests. The forest is dominated by tall dipterocarps, especially Hollong (Dipterocarpus macrocarpus), which grows up to 50 m. The area is hilly, being part of Patkai Range, is known for the rare White-winged Duck Cairina scutulata.

Key Biodiversity 

AVIFAUNA: Not much is known about the bird life, except for the presence of White-winged Duck (Choudhury 1996, 2002), a globally threatened species (BirdLife International 2001). According to Choudhury (pers. comm. 2003), a sizeable population of White-winged Duck occurs in this IBA. In 1993, two ducks were seen in a nullah (stream), about 0.5 km off the main road near Namsanmukh village, and later three birds in flight were in the same spotted environs.

The White-bellied Heron Ardea insignis, Pale-capped Pigeon Columba punicea, Rufous-necked Hornbill Aceros nipalensis, and Beautiful Nuthatch Sitta formosa, all globally threatened, were seen in the neighbouring Dirak Reserved Forest, Joypur Reserve Forest and Upper Dihing (West Block) Reserve Forest by Mridupaban Phukan (pers. comm. to Kulojyoti Lahkar).

A checklist of the birds of this IBA is not available, but judging from the extant habitat, there could be 250 to 300 species, including many Restricted Range and Biome-restricted species. The area comes under Eastern Himalayas Endemic Bird Area (Stattersfield et al. 1998) and Biome-9 (Indo-Chinese Tropical Moist Forest) (BirdLife International, undated).

OTHER KEY FAUNA: There has been no detailed study on the mammalian and reptilian fauna of this site, but incidental data reveals that Asian Elephant Elephas maximus, Capped Langur Trachypithecus pileatus, Hoolock Gibbon Hylobates hoolock, Tiger Panthera tigris, Leopard P. pardus, Barking Deer Muntiacus muntjak and Sambar Cervus unicolor are known to occur.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
White-winged Duck Asarcornis scutulata resident  2004  present  A1  Endangered 
White-bellied Heron Ardea insignis resident  2004  present  A1  Critically Endangered 
Pale-capped Pigeon Columba punicea resident  2004  present  A1  Vulnerable 
Rufous-necked Hornbill Aceros nipalensis resident  2004  present  A1  Vulnerable 
Yellow-vented Warbler Phylloscopus cantator resident  2004  present  A2  Least Concern 
Beautiful Nuthatch Sitta formosa resident  2004  present  A1  Vulnerable 


IUCN habitat Habitat detail Extent (% of site)
Forest   -
Wetlands (inland)   -

Acknowledgements Key contributor: Anwaruddin Choudhury.


BirdLife International (undated) Important Bird Areas (IBAs) in Asia: Project briefing book. BirdLife International, Cambridge, U.K. Unpublished.

BirdLife International (2001) Threatened Birds of Asia: The BirdLife International Red Data Book. BirdLife International, Cambridge, U.K.

Choudhury, A. U. (1996) Survey of the White-winged Wood Duck and the Bengal Florican in Tinsukia district and adjacent areas. The Rhino Foundation for Nature in NE India, Guwahati. Pp. 82.

Choudhury, A. U. (2002) Conservation of the Whitewinged Wood Duck Cairina scutulata in India. Pp. 52-64. In: Proceedings of the Salim Ali Centenary Seminar on the Conservation of Avifauna of Wetlands and Grasslands, 1996. (Eds: Rahmani, A. R. and Ugra, G.). Bombay Natural History Society, Mumbai.

Stattersfield, A. J., Crosby, M. J., Long, A. J. and Wege, D. C. (1998). Endemic Bird Areas of the World: Priorities for Biodiversity Conservation. BirdLife Conservation Series No. 7. BirdLife International, U.K.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Namsangmukh - Borduria. Downloaded from on 28/10/2016

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