Arborophila mandellii
Silhouette: PhyloPic
In 3 days <5% in a week ~10%
The chestnut-breasted partridge (Arborophila mandellii) is a partridge species endemic to the eastern Himalayas north of the Brahmaputra, and occurs in Bhutan, Darjeeling, Sikkim, Arunachal Pradesh and south-eastern Tibet at elevations from 350 to 2,500 m (1,150 to 8,200 ft). It is listed as near threatened on the IUCN Red List, as the estimated population comprises less than 10,000 individuals. It is threatened by forest degradation and by hunting. It is known from at least three protected areas, including Singalila National Park and Namdapha National Park.
The scientific name commemorates the Italian naturalist Louis Mandelli. It is a distinctive partridge with chestnut breast-band and grey belly. It is distinguished from the similar rufous-throated partridge A. rufogularis by more rufescent crown and head-sides, white gorget and entirely chestnut upper breast.
In 2015, the first photograph of this species in the wild was taken in Arunachal Pradesh. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Royal Manas National Park | 🇧🇹 Bhutan |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Chestnut-breasted Hill Partridge sighting in Royal Manas National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 339th most-seen of the 388 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Chestnut-breasted Hill Partridge in Royal Manas National Park on a given day, so our monthly data shows no clear season. August and September have too few records to rate.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Chestnut-breasted Hill Partridge sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Royal Manas National Park, in our data
Royal Manas National Park is the only park on Wallace's Line with enough records to rate Chestnut-breasted Hill Partridge sightings: under 5% of wildlife watchers there report one on a given day.
Same genus: Arborophila
The closest relatives of the Chestnut-breasted Hill Partridge that you can see in Royal Manas National Park (genus Arborophila, Hill-Partridges) are Rufous-throated Hill Partridge (about 10%) and Common Hill Partridge (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Chestnut-breasted Hill Partridge is recorded against all the birds logged in Royal Manas National Park (8 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
