Formicivora iheringi
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
The narrow-billed antwren (Formicivora iheringi) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is endemic to eastern Brazil. The narrow-billed antwren is monotypic.
The narrow-billed antwren is not closely related to other members of genus Formicivora. In the early twentieth century some authors placed it in the monotypic genus Neorhopias. More recent studies have revived that suggestion.
The narrow-billed antwren is 11 to 12 cm (4.3 to 4.7 in) long; one male weighed 8.2 g (0.29 oz). The species is sexually dimorphic and has a longish bill and tail. Adult males are mostly dark gray. Their wings and tail are a darker blackish gray, with white tips on the wing coverts and the outer tail feathers. The center of their throat and breast are black, their flanks white, and their undertail coverts have white bars. Adult females have a pale supercilium and a whitish eye ring. They have olive-brown upperparts with a grayer crown; the olive-brown becomes reddish yellow-brown on the uppertail coverts. Their wings are brown with pale cinnamon edges on the coverts and reddish edges on the flight... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chapada Diamantina National Park | 🇧🇷 Brazil |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Narrow-billed Antwren sighting in Chapada Diamantina National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 258th most-seen of the 271 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 Narrow-billed Antwren in Chapada Diamantina National Park on a given day, so our monthly data shows no clear season.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Narrow-billed Antwren 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 Chapada Diamantina National Park, in our data
Chapada Diamantina National Park is the only park on Wallace's Line with enough records to rate Narrow-billed Antwren sightings: under 5% of wildlife watchers there report one on a given day.
Same genus: Formicivora
The closest relatives of the Narrow-billed Antwren that you can see in Chapada Diamantina National Park (genus Formicivora, Black-bellied Antwrens) are Sincorá Antwren (about 40%) and Rusty-backed Antwren (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Narrow-billed Antwren is recorded against all the birds logged in Chapada Diamantina National Park (14 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.
