Herpsilochmus longirostris
Silhouette: Sheatherius · PhyloPic
In 3 days ~50% in a week ~80%
The large-billed antwren (Herpsilochmus longirostris) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Bolivia and Brazil. The large-billed antwren was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name Herpsilochmus longirostris. Its relationship to others of its genus is unclear but it apparently is most closely related to the pectoral antwren (H. pectoralis), and at least one author has considered them to form a superspecies.
The large-billed antwren is monotypic. The large-billed antwren is 12 to 13 cm (4.7 to 5.1 in) long and weighs 12 to 14 g (0.42 to 0.49 oz). As its English name and specific epithet imply, its bill is heavier than those of most other Herpsilochmus antwrens. Adult males have a black crown and nape, a long whitish supercilium, a narrow black streak through the eye, and grayish ear coverts. Their back and rump are gray with a black and white patch between the scapulars and white-tipped black uppertail coverts. Their wings are black with white-tipped coverts and flight feathers with white edges towards... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Emas National Park | 🇧🇷 Brazil | |
| 2 | Chapada dos Guimarães National Park | 🇧🇷 Brazil | |
| 3 | Parque Estadual Encontro das Águas | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Campo Grande | 🇧🇷 Brazil | |
| 2 | Goiânia | 🇧🇷 Brazil | |
| 3 | Brasilia | 🇧🇷 Brazil |
Possible
About 20% of wildlife watchers report a Large-billed Antwren sighting in Chapada dos Guimarães National Park on a given day, based on 146 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 62nd most-seen of the 273 birds we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
October
In that month about 40% of wildlife watchers report a Large-billed Antwren in Chapada dos Guimarães National Park on a given day, against about 10% in August and November–January, the lowest months. February to April have too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Large-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.
2nd of 3
Of the 3 parks where we can rate Large-billed Antwren sightings, Chapada dos Guimarães National Park ranks 2nd at about 20%. The best odds are in Emas National Park (Brazil, about 30%).
Same family: Thamnophilidae
The closest relatives of the Large-billed Antwren that you can see in Chapada dos Guimarães National Park (family Thamnophilidae, Typical Antbirds) are Planalto Slaty-Antshrike (about 20%), Barred Antshrike (about 20%) and Great Antshrike (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Large-billed Antwren is recorded against all the birds logged in Chapada dos Guimarães National Park (146 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.
