Both Chestnut-necklaced Partridge found at Peninsula Malaysia and Borneo belong to 2 sub-species

Arborophila charltonii charltonii (S Thailand to S Myanmar and Malay Peninsula)

– very less sighting

 

 

Arborophila charltonii graydoni (N Borneo)

– quite common at lowland forest @Sabah

– Borneo Subspecies Endemic

The head, belly, wing are the major different for both birds.

update 20191013

another close encounter of this Partridge

 

 

Phasianidae Series: Partridge | 雉科: 鹧鸪 | liewwk Nature 8-4 [update 20240331]