Introduction
The Chestnut-necklaced Partridge, Tropicoperdix charltonii, is a shy, ground-dwelling member of the pheasant family, Phasianidae. It inhabits lowland and lower hill forests in parts of mainland Southeast Asia and Sumatra. The species was formerly placed in the genus Arborophila, but molecular studies support its placement in Tropicoperdix.
Physical Description
The Chestnut-necklaced Partridge is a compact forest bird measuring approximately 26–32 cm in length. Adults have brown upperparts finely marked with darker and buff tones, providing effective camouflage in leaf litter and dense undergrowth.
The head and nape are brown and finely speckled. A pale supercilium extends behind the eye, while the throat and neck are whitish with brown streaking. The most distinctive feature is the rich chestnut colouring across the upper breast, bordered above by a dark collar. The lower breast is brown, and the belly and flanks are buff with dark, scale-like markings. The bill is greenish yellow and the legs are generally yellowish.
Males are slightly larger and more strongly coloured than females. Published measurements give approximate weights of 290 g for males and 250 g for females. Juvenile plumage is less well documented, but young birds are expected to be duller and less sharply marked than adults.
Range and Habitat
The species has a discontinuous distribution. It occurs from southern Myanmar and southern Thailand through the Malay Peninsula, with additional populations or historical records from northern Sumatra, including Aceh and parts of southern Sumatra. Older sources also included populations now treated separately, such as the Sabah Partridge, Tropicoperdix graydoni, so records from Borneo should not automatically be attributed to the Chestnut-necklaced Partridge.
It is associated mainly with broadleaved evergreen forest, especially dense lowland forest and lower hill forest with substantial undergrowth and leaf litter. It may also occur locally in secondary forest, bamboo-dominated vegetation and disturbed woodland where dense cover remains. The species is not migratory and is generally regarded as resident.
For the nominate form in the Thai-Malay region, the species is chiefly a low-elevation bird, occurring to about 500 m in many areas. The Sumatran form is also associated principally with lowland or lower hill forest. Its fragmented distribution reflects both natural geographic separation and the loss of suitable forest.
Behaviour and Diet
The Chestnut-necklaced Partridge is primarily terrestrial and usually remains within dense ground vegetation. It is secretive and is more often detected by its calls than seen in the open. Birds may occur singly, in pairs or in small family groups.
It probably forages through leaf litter and loose soil for seeds, fallen fruit, berries, termites and other small invertebrates. The species is not known to undertake regular long-distance movements. Its short, rounded wings are suited to sudden escape flights through dense vegetation rather than sustained travel.
The call consists of clear, repeated whistles, often delivered as couplets or triplets. Partners may answer one another, and calling is most likely during the morning and late afternoon. Detailed information on courtship, nesting and parental care remains limited. Confirmed breeding data are insufficient to support the clutch size, incubation period and breeding-season claims sometimes repeated in general accounts.
Identification Tips
Look for a boldly patterned, medium-sized partridge moving quietly through dense forest undergrowth. The most useful field marks are:
- A rich chestnut upper breast forming the species’ characteristic necklace-like marking.
- A dark collar above the chestnut breast.
- A pale, streaked throat and neck.
- Brown, finely patterned upperparts and buff underparts with dark scaling on the lower breast and flanks.
- Tawny or brown ear-coverts, a brown crown and nape, and yellowish legs.
- A preference for walking through leaf litter rather than remaining in exposed areas.
The Chestnut-necklaced Partridge should be separated from the Green-legged Partridge, Tropicoperdix chloropus, and from other forest partridges by its chestnut breast band, dark collar and overall combination of pale streaked neck, brown upperparts and scaled lower flanks. Records from Sabah require particular care because the formerly associated Sabah Partridge is now generally treated as a separate species, Tropicoperdix graydoni.
Conservation Status
The Chestnut-necklaced Partridge is currently assessed as Vulnerable on the IUCN Red List. The population is suspected to be declining, although reliable global population estimates are not available.
The principal threats are the clearance, degradation and fragmentation of evergreen forest through logging, agricultural expansion, plantation development and fire. Hunting and trapping for food or trade may add pressure, particularly where remaining populations are small and isolated. The Sumatran populations are of particular concern because suitable habitat has been extensively reduced and the species is difficult to survey.
Important conservation measures include protecting remaining lowland and lower hill forests, maintaining habitat corridors between isolated forest blocks, preventing illegal trapping and improving field surveys. Recent records from Sumatra demonstrate the value of targeted surveys, as the species can persist undetected in remote forest areas.
Frequently Asked Questions
What is the scientific name of the Chestnut-necklaced Partridge?
The accepted scientific name is Tropicoperdix charltonii. It was formerly widely known as Arborophila charltonii.
Where does the Chestnut-necklaced Partridge live?
It occurs in a discontinuous range extending from southern Myanmar and southern Thailand through the Malay Peninsula, with additional populations or historical records in northern and southern Sumatra.
What habitat does this partridge prefer?
It prefers dense broadleaved evergreen forest, particularly lowland and lower hill forest with thick undergrowth, leaf litter and cover close to the ground. It may also use suitable secondary forest and bamboo-rich vegetation.
What does the Chestnut-necklaced Partridge eat?
Available information indicates a mixed diet of seeds, fallen fruit, berries, termites and other small invertebrates collected from the forest floor.
Is the Chestnut-necklaced Partridge endangered?
It is classified as Vulnerable on the IUCN Red List. Habitat loss, forest fragmentation, fire, logging and trapping are the main recognised threats.
How can it be identified in the field?
The combination of a chestnut upper breast, dark collar, pale streaked neck, brown patterned upperparts and buff, dark-scaled flanks is distinctive. It is usually found walking quietly through dense forest undergrowth or detected by its repeated whistles.
References
- BirdLife International. 2016. Arborophila charltonii. The IUCN Red List of Threatened Species 2016: e.T22727395A94948018. https://doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22727395A94948018.en. Accessed 8 September 2026.
- Chen, D., Liu, Y., Davison, G. W. H., Dong, L., Chang, J., Gao, S. H., Li, S.-H. and Zhang, Z. W. 2015. Revival of the genus Tropicoperdix Blyth 1859 (Phasianidae, Aves) using multilocus sequence data. Zoological Journal of the Linnean Society, 175(2), 429–438. https://doi.org/10.1111/zoj.12273.
- Chen, D., Braun, E. L., Forthman, M., Kimball, R. T. and Zhang, Z. 2018. A simple strategy for recovering ultraconserved elements, exons, and introns from low coverage shotgun sequencing of museum specimens: placement of the partridge genus Tropicoperdix within the Galliformes. Molecular Phylogenetics and Evolution, 129, 304–314. https://doi.org/10.1016/j.ympev.2018.09.005.
- Gill, F., Donsker, D. and Rasmussen, P., eds. 2026. IOC World Bird List, version 15.2. International Ornithologists’ Union. https://www.worldbirdnames.org/. Accessed 8 September 2026.
- Jeyarajasingam, A. 2012. A Field Guide to the Birds of Peninsular Malaysia and Singapore. Oxford University Press.
- Madge, S. and McGowan, P. 2010. Pheasants, Partridges and Grouse: Including Buttonquails, Sandgrouse and Allies. Bloomsbury Publishing.
- Oriental Bird Club. n.d. First Sumatran records of Chestnut-necklaced Partridge Tropicoperdix charltonii atjenensis since 1939. BirdingASIA 40. https://www.orientalbirdclub.org/birdingasia-40. Accessed 8 September 2026.
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