Herpsilochmus rufimarginatus
Silhouette: Sheatherius · PhyloPic
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Rufous-margined Antwren sighting in Niterói on a given day, based on 37 verified sightings from GBIF citizen-science data. It is the 56th most-seen of the 116 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
June and October–November
In those months about 10% of wildlife watchers report a Rufous-margined Antwren in Niterói on a given day, against under 5% in July–September and December–May, the lowest months.
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.
3rd of 4
Of the 4 cities where we can rate Rufous-margined Antwren sightings, Niterói ranks 3rd at under 5%. The best odds are in Santos (Brazil, about 10%) and Rio de Janeiro (Brazil, about 10%).
GBIF citizen-science records
It is estimated from how often the Rufous-margined Antwren is recorded against all the birds logged in Niterói (37 verified sightings), 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.
