Locustella castanea
Silhouette: Afsarnayakkan · PhyloPic
In 3 days <5% in a week ~10%
The Sulawesi bush warbler (Locustella castanea) is a species of Old World warbler in the family Locustellidae. It is endemic to the island of Sulawesi in Indonesia where it is found on the forest floor. There are two subspecies:
It has a preference for moss-covered rocks and tree trunks densely clad with vines. On Seram it frequents lower mountain slopes in Lithospermum and Castanopsis woodland with Shorea, Agathis and Dacrydium trees, ferns and mosses, and also dense patches of bamboo. One of the places where this bird can be found on Sulawesi is the Gunung Ambang Nature Reserve.
The Sulawesi bush warbler is a mostly ground-dwelling bird, skulking in the undergrowth and running on the forest floor in a manner reminiscent of a mouse. It often flicks its wings over its back and cocks its tail slightly. It sometimes sings perched on a low... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tangkoko Nature Reserve | 🇮🇩 Indonesia |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Chestnut-backed Bush-Warbler sighting in Tangkoko Nature Reserve on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 118th most-seen of the 138 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-backed Bush-Warbler in Tangkoko Nature Reserve on a given day, so our monthly data shows no clear season.
Between 4 and 7 pm
Across all the parks we cover, that three-hour window holds the most Chestnut-backed Bush-Warbler sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Tangkoko Nature Reserve, in our data
Tangkoko Nature Reserve is the only park on Wallace's Line with enough records to rate Chestnut-backed Bush-Warbler sightings: under 5% of wildlife watchers there report one on a given day.
Same order: Passeriformes
The closest relatives of the Chestnut-backed Bush-Warbler that you can see in Tangkoko Nature Reserve (order Passeriformes, Perching Birds) are Hair-crested Drongo (about 70%), Finch-billed Myna (about 50%) and Grey-sided Flowerpecker (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Chestnut-backed Bush-Warbler is recorded against all the birds logged in Tangkoko Nature Reserve (10 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.
