Investigating the range, ecology and threats faced by the orange-necked hill-partridge - Vietnam

The distribution and ecology if the orange-necked hill-partridge Arborophila davidi has been eluding scientists since Jean Delacour first recorded it in 1927. The species was believed to be endemic to East Cochinchina, where it was discovered by Jean Delacour and not seen again until 1991, where it was recorded in Cat Tien National Park. In 2002, a single bird was caught in a trap in southern Mondulkiri Province, which further extended its range. From these limited observations the orange-necked hill-partridge is known to occur in evergreen forest from 120m to 300m, favouring steep hills covered with non-thorny bamboo, but more specific details are unknown. This project aimed to undertake detailed surveys to establish range, distribution and ecology of the species. 

Project commenced: 2002
Status: Complete
Partners: WPA, Institute of Tropical Ecology (Ho Chi Ming City) and Department of Forestry

The orange-necked hill partridge is listed as endangered on the IUCN Red List because it has both a small population and range that are thought to be declining and undergoing severe fragmentation. In 1994 the global population was estimated as fewer than 1000 individuals. In Vietnam the species faces a number of threats, primarily from hunting, extensive deforestation and habitat loss through commercial logging, illegal timber collection and clearance of land for cultivation. Numerous sites were surveyed within the hill-partridge;s believed range.


  • establish its presence and clarify its geographical range
  • establish its habitat requirements and abundance in suitable habitats
  • collect ecological information
  • assess the threats faced by the species


The results of the survey extended the species range into new areas, Bu Gia Map National Park and Tan Phu State Forest Enterprise. 

The species was found in low densities, with the population in Bu Gia Map National Park estimated at 242 individuals. It is likely that many remnant forest blocks within a number of specially protected forests harbour orange-necked hill-partridge. 

Alongside further surveys, planned future work involves an environmental education programme for rural communities and an increased enforcement of wildlife protection laws. 

Key Species

Orange-neck hill-partridge Arborophila davidi

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