Castanozoster thoracicus
Silhouette: Sheatherius · PhyloPic
In 3 days ~50% in a week ~80%
The bay-chested warbling finch (Castanozoster thoracicus) is a species of bird in the family Thraupidae. It is endemic to southeastern Brazil. Its natural habitats are temperate forests and subtropical or tropical moist montane forests.
The bay-chested warbling finch was formally described in 1835 by the Finnish naturalist Alexander von Nordmann from a specimen collected in Brazil. He coined the binomial name Fringilla thoracica. This species was traditionally placed in the genus Poospiza. A molecular phylogenetic study published in 2014 found that the genus was polyphyletic. In the subsequent reorganisation the bay-chested warbling finch was moved to its own newly erected genus Castanozoster. The name combines the Ancient Greek καστανό meaning "chestnut" with ζωστήρ meaning "belt". The bay-chested warbling finch is monotypic: no subspecies are recognised.
The bay-chested warbling finch is a rather dainty, warbler-like finch, measuring 13.5 cm long on average and with an average weight of 11–12.8 g. Males have gray upperparts, getting progressively browner from the head to the tail. The grayish upper-wing displays a white flash when the wings are closed... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Itatiaia National Park | 🇧🇷 Brazil |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Bay-chested Warbling-Finch sighting in Itatiaia National Park on a given day, based on 501 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 87th most-seen of the 352 birds we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
June–August and November
In those months about 30% of wildlife watchers report a Bay-chested Warbling-Finch in Itatiaia National Park on a given day, against about 10% in January–February and May, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Bay-chested Warbling-Finch sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Itatiaia National Park, in our data
Itatiaia National Park is the only park on Wallace's Line with enough records to rate Bay-chested Warbling-Finch sightings: about 20% of wildlife watchers there report one on a given day.
Same family: Thraupidae
The closest relatives of the Bay-chested Warbling-Finch that you can see in Itatiaia National Park (family Thraupidae, Tanagers and Allies) are Saffron Finch (about 60%), Sayaca Tanager (about 60%) and Green-winged Saltator (about 60%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Bay-chested Warbling-Finch is recorded against all the birds logged in Itatiaia National Park (501 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.
