Formicivora rufa
Silhouette: Sheatherius · PhyloPic
In 3 days ~60% in a week ~80%
The rusty-backed antwren (Formicivora rufa) is a species of bird in the family Thamnophilidae, the "typical antbirds". It is found in Bolivia, Brazil, Paraguay, Peru, and Suriname. The rusty-backed antwren is 12 to 13 cm (4.7 to 5.1 in) long and weighs 11.5 to 14 g (0.41 to 0.49 oz). The males of all three subspecies have a tawny rufous crown and upperparts. They have a white supercilium and the rest of the face and the throat are black. The middle of the breast is black with a white edge separating it from the cinnamon-buff flanks; the belly is white. The folded wings show lines of white dots. The tail feathers are black with chestnut fringes, white sides, and white tips. The nominate female has paler rufous upperparts than the male. The face, throat, and chest are streaked black and white and the rest of the underparts are cinnamon. The female of F. r. urubambae has much heavier streaking on the underparts than the nominate and its tail is blacker. The female of F. r. chapmani is intermediate between the other two subspecies... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Emas National Park | 🇧🇷 Brazil | |
| 2 | Chapada Diamantina National Park | 🇧🇷 Brazil | |
| 3 | Chapada dos Guimarães National Park | 🇧🇷 Brazil | |
| 4 | Parque Estadual Encontro das Águas | 🇧🇷 Brazil |
Possible
About 20% of wildlife watchers report a Rusty-backed Antwren sighting in Emas National Park on a given day, based on 50 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 80th most-seen of the 187 birds we can rate there. Over three days the chance rises to about 60%, and over a week to about 80%, if each day is a fresh chance.
May and August–October
In those months about 30% of wildlife watchers report a Rusty-backed Antwren in Emas National Park on a given day, against about 10% in July and November, the lowest months. Those are among Emas National Park's driest months, with about 45 mm of rain a month against 190 mm in January. April and December–February have too few records to rate.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Rusty-backed 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.
Yes
Of the 4 parks where we can rate Rusty-backed Antwren sightings, Emas National Park has the highest daily chance: about 20%. Next come Chapada Diamantina National Park (Brazil, about 10%) and Chapada dos Guimarães National Park (Brazil, about 10%).
Same family: Thamnophilidae
The closest relatives of the Rusty-backed Antwren that you can see in Emas National Park (family Thamnophilidae, Typical Antbirds) are Large-billed Antwren (about 30%), Barred Antshrike (about 20%) and Rufous-winged Antshrike (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rusty-backed Antwren is recorded against all the birds logged in Emas National Park (50 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.
