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Location India, Assam
Central coordinates 95o 43.50' East  27o 39.50' North
IBA criteria A1
Area 6,050 ha
Altitude 0
Year of IBA assessment 2004

Bombay Natural History Society

Site description Dum Duma (2,880 ha), Dangori (920 ha) and Kumsong (2,250 ha), these three reserve forests in Tinsukia district, in eastern Assam constitute the IBA. The forests of all areas are Tropical Evergreen Rainforest types dominated by Dipterocarpus macrocarpus (Hollong) on flat plains. All these areas are surrounded by tea gardens and human settlements. These forests are known for their populations of White-winged Duck Cairina scutulata, but are also important for other wildlife, especially primates. The largest confirmed gathering of the White-winged Duck in the world was recorded in Dangori RF, where 14 were seen roosting at one site in 1995 (Choudhury 1996, 1998). The vegetation type of the sites is mainly Tropical Evergreen Rainforest, dominated by Dipterocarpus macrocarpus, Shorea assamica, Mesua ferrea, Terminalia myriocarpa, Artocarpus chaplasha, Dillenia indica, Anthocephalus cadamba, Bombax ceiba and Ficus spp. There are many jungle pools or ponds in these areas, which are the major haunts of the White-winged Duck.

Key Biodiversity 

AVIFAUNA: The site is important for rainforest birds. More than 100 species have been recorded but more are likely to occur (A. U. Choudhury pers. comm. 2002). The White-winged Duck and Brown Hornbill Anorrhinus tickelli are noteworthy species while there are reports of the Masked Finfoot Heliopais personata from Dum Duma RF (Choudhury 1997). Sino-Himalayan Subtropical Forest species (Biome-8) such as Blue-throated Barbet Megalaima asiatica, Bay Woodpecker Blythipicus pyrrhotis, White-throated Bulbul Alophoixus flaveolus, Black-winged Cuckoo-shrike Coracina melaschistos and Nepal Fulvetta Alcippe nipalensis are commonly seen. This site has been selected as an IBA as it is one of the most important areas for the long-term protection of the globally Endangered White-winged Duck.

OTHER KEY FAUNA: Leopard Panthera pardus, Hoolock Gibbon Hylobates hoolock, Capped Langur Trachypithecus pileatus, Rhesus Macaque Macaca mulatta, Pig-tailed Macaque M. nemestrina, Slow Loris Nycticebus coucang, Malayan Giant Squirrel Ratufa bicolor, Common Giant Flying Squirrel Petaurista petaurista, Barking Deer or muntjak Muntiacus muntjak and a small herd of Wild Water Buffalo Bubalus arnee (= bubalis). The Wild Elephant Elephas maximus and Tiger Panthera tigris are no longer found here.

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 
Lesser Adjutant Leptoptilos javanicus resident  2004  present  A1  Vulnerable 
White-rumped Vulture Gyps bengalensis non-breeding  2004  present  A1  Critically Endangered 
Slender-billed Vulture Gyps tenuirostris non-breeding  2004  present  A1  Critically Endangered 
Masked Finfoot Heliopais personatus resident  2004  present  A1  Endangered 

IBA Monitoring

2003 high not assessed not assessed
Good - based on reliable and complete / representative data

Agriculture and aquaculture annual & perennial non-timber crops - small-holder farming happening now some of area/population (10-49%) very rapid to severe deterioration high
Biological resource use fishing & harvesting aquatic resources - unintentional effects: subsistence/small scale happening now small area/few individuals (<10%) slow but significant deterioration low
Biological resource use hunting & collecting terrestrial animals - intentional use (species being assessed is the target) happening now some of area/population (10-49%) moderate to rapid deterioration high
Biological resource use logging & wood harvesting - unintentional effects: subsistence/small scale happening now small area/few individuals (<10%) moderate to rapid deterioration low
Human intrusions and disturbance work and other activities happening now small area/few individuals (<10%) slow but significant deterioration low
Pollution agricultural & forestry effluents - herbicides and pesticides happening now small area/few individuals (<10%) slow but significant deterioration low


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

Land use

Land-use Extent (% of site)
forestry -
Notes: Forest

Acknowledgements Key contributors: Anwaruddin Choudhury and Kulojyoti Lahkar.


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

Choudhury, A. U. (1997) Current status of the Masked finfoot in India. Newsletter for Birdwatchers 37(5): 90-91.

Choudhury, A. U. (1998) Status and conservation of the white-winged duck in eastern Assam, India. OBC Bulletin 28:14-17.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Dum Duma, Dangori and Kumsong Reserve Forests. Downloaded from on 28/10/2016

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