Formicivora rufa
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
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 |
Rare
Under 5% of wildlife watchers report a Rusty-backed Antwren sighting in Parque Estadual Encontro das Águas on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 255th most-seen of the 308 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 Rusty-backed Antwren in Parque Estadual Encontro das Águas on a given day, so our monthly data shows no clear season. January to April 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.
4th of 4
Of the 4 parks where we can rate Rusty-backed Antwren sightings, Parque Estadual Encontro das Águas ranks 4th at under 5%. The best odds are in Emas National Park (Brazil, about 20%), 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 Parque Estadual Encontro das Águas (family Thamnophilidae, Typical Antbirds) are Great Antshrike (about 20%), Mato Grosso Antbird (about 20%) and Barred Antshrike (about 10%), 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 Parque Estadual Encontro das Águas (12 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.
