Western Siem Pang This is an IBA in Danger! 

IBA Justification

The site was identified as important in 2003 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Green Peafowl Pavo muticus EN resident 2002 rare A1, A3
Sarus Crane Grus antigone VU unknown 2002 rare A1
Lesser Adjutant Leptoptilos javanicus VU resident 2002 rare A1
White-shouldered Ibis Pseudibis davisoni CR resident 2002 common A1
Giant Ibis Thaumatibis gigantea CR resident 2002 rare A1, A4i
Red-headed Vulture Sarcogyps calvus CR non-breeding 2002 rare A3
White-rumped Vulture Gyps bengalensis CR non-breeding 2002 rare A1, A3
Slender-billed Vulture Gyps tenuirostris CR non-breeding 2002 present A1
Greater Spotted Eagle Clanga clanga VU winter 2002 rare A1
Rufous-winged Buzzard Butastur liventer LC resident 2002 common A3
Lineated Barbet Psilopogon lineatus LC resident 2002 common A3
Small Minivet Pericrocotus cinnamomeus LC resident 2002 common A3
Common Woodshrike Tephrodornis pondicerianus LC resident 2002 common A3
White-browed Fantail Rhipidura aureola LC resident 2002 common A3
Brown Prinia Prinia polychroa LC resident 2002 common A3
Sooty-headed Bulbul Pycnonotus aurigaster LC resident 2002 common A3
Streak-eared Bulbul Pycnonotus blanfordi LC resident 2002 common A3

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2003).

IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2016 not assessed very high medium
Was the whole site assessed? State assessed by Accuracy of information
no unset medium

Pressure (threats to the trigger species and/or their habitats)
Threat level 1 Threat level 2 Timing Scope Severity Result
Agricultural expansion and intensification annual & perennial non-timber crops - agro-industry farming likely in short term (within 4 years) small area/few individuals (<10%) slow but significant deterioration low
Biological resource use hunting & collecting terrestrial animals - unintentional effects (species is not the target) happening now whole area/population (>90%) slow but significant deterioration high
Biological resource use logging & wood harvesting - unintentional effects: large scale likely in short term (within 4 years) whole area/population (>90%) very rapid to severe deterioration very high
Transportation and service corridors roads and railroads happening now some of area/population (10-49%) slow but significant deterioration medium

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation action Result
Most of site (50-90%) covered (including the most critical parts for important bird species) A management plan exists but it is out of date or not comprehensive Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA conservation status, please click here

Local Conservation Groups

The Local Conservation Groups listed below are working to support conservation at this IBA.

Name Year formed
Western Siem Pang Local Conservation Group 2004
For more information on BirdLife's work with Local Conservation Groups, please click here.


Habitat (IUCN level 1) Habitat detail Extent (% of site)
Forest Lowland evergreen rain forest (tropical), Semi-evergreen rain forest (tropical), Dry deciduous forest (tropical) -
Shrubland Secondary scrub -
Grassland Edaphic grassland -
Wetlands (inland) Rivers and streams, Freshwater lakes and pools, Ephemeral wetlands -
Artificial/Terrestrial Rice paddies, Perennial crops, orchards and groves, Forestry and agro-industrial plantations, Small settlements, rural gardens -
For more information about the IUCN Habitat classification, please click here.

Land use

Land-use Extent (% of site)
agriculture -
not utilised -

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Western Siem Pang. Downloaded from on 27/09/2023.