Chestnut-necklaced Hill Partridges inhabit lowland forest in Thailand and Malaysia. Yellow legs and an orange patch behind the eye help identify them.
A chestnut mark forms a collar-like pattern around the neck. The bird also has an orange patch behind the eye and yellow legs.
Chestnut-necklaced Partridges forage on the ground in lowland tropical forests, including dark vegetation with dense trees and vines. The species includes the Sumatran subspecies atjenensis as well as Thai–Malay populations.
On the morning of 31 July 2023, observers found atjenensis feeding in northern Aceh, Sumatra. It was beside a roughly four-metre-wide stream at about 150 metres elevation, in regenerating forest fragmented by plantations. Photographs documented this long-unrecorded Sumatran population.
The observers also detected the species in two other areas, including by its repeated vibrating call, lasting less than a minute. Sightings and sounds revealed birds living in the shaded forest. Beside the stream, a bird previously known from old specimens was still feeding.
IUCN Red List · Vulnerable · Global
The 2021 IUCN assessment lists Chestnut-necklaced Partridge as globally Vulnerable, identifying lowland-forest conversion and trapping as threats. The 2023 Aceh report also describes forest fragmented by logging and plantation development. Protecting remaining lowland forest is a conservation priority.