Herpsilochmus rufimarginatus
Silhouette: Sheatherius · PhyloPic
In 3 days ~80% in a week >90%
The rufous-margined antwren (Herpsilochmus rufimarginatus) is an insectivorous bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds." It is found in Argentina, Brazil, and Paraguay. The rufous-margined antwren was described by the Dutch zoologist Coenraad Jacob Temminck in 1822 and given the binomial name Myiothera rufimarginata. It is now placed in the genus Herpsilochmus which was introduced by the German ornithologist Jean Cabanis in 1847.
The specific epithet rufimarginatus is from the Latin rufus "rufous" and marginatus "marginned" or "bordered." The rufous-margined antwren's taxonomy is unsettled. Before 2020 the American Ornithological Society, the International Ornithological Committee, and the Clements taxonomy treated it and what is now the rusty-winged antwren (Herpsilochmus frater) as a single species, the rufous-winged antwren with the binomial H. rufimarginatus.
These systems assigned it four subspecies: Beginning in 2020 these systems split the rufous-winged antwren... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Serra dos Órgãos National Park | 🇧🇷 Brazil | |
| 2 | Iguazú National Park | 🇦🇷 Argentina | |
| 3 | Iguaçu National Park | 🇧🇷 Brazil | |
| 4 | Tijuca National Park | 🇧🇷 Brazil | |
| 5 | Itatiaia National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Santos | 🇧🇷 Brazil | |
| 2 | Rio de Janeiro | 🇧🇷 Brazil | |
| 3 | Niterói | 🇧🇷 Brazil | |
| 4 | São Paulo | 🇧🇷 Brazil |
Likely
About 50% of wildlife watchers report a Rufous-margined Antwren sighting in Serra dos Órgãos National Park on a given day, based on 275 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 45th most-seen of the 336 birds we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
May, July and September
In those months about 60% of wildlife watchers report a Rufous-margined Antwren in Serra dos Órgãos National Park on a given day, against about 20% in November, the lowest month. Those are among Serra dos Órgãos National Park's driest months, with about 90 mm of rain a month against 310 mm in November.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Rufous-margined Antwren sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 5 parks where we can rate Rufous-margined Antwren sightings, Serra dos Órgãos National Park has the highest daily chance: about 50%. Next come Iguazú National Park (Argentina, about 40%) and Iguaçu National Park (Brazil, about 40%). All parks ranked.
Same family: Thamnophilidae
The closest relatives of the Rufous-margined Antwren that you can see in Serra dos Órgãos National Park (family Thamnophilidae, Typical Antbirds) are Streak-capped Antwren (about 50%), Plain Antvireo (about 40%) and Spot-breasted Antvireo (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rufous-margined Antwren is recorded against all the birds logged in Serra dos Órgãos National Park (275 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.
