Ramphotrigon megacephalum
Silhouette: Emily Willoughby · PhyloPic
In 3 days ~20% in a week ~30%
The large-headed flatbill (Ramphotrigon megacephalum), also known as the bamboo flatbill, is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Brazil, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, and Venezuela.
The large-headed flatbill was formally first described as an illustration, though not in text, as the "great-headed flycatcher", Tyrannula megacephala. Later it was placed in genus Tolmomyias. It has also had the binomial Ramphotrigon megacephala and some authors have called it the "bamboo Flatbill".
The large-headed flatbill has these four subspecies: The sexes have the same plumage. Adults of the nominate subspecies R. m. megacephalum have a dark olive crown, dusky lores, a whitish to yellowish streak behind the lores, and a whitish to yellowish eye-ring on an otherwise dark olive face. Their upperparts... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Itatiaia National Park | 🇧🇷 Brazil | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru | |
| 3 | Serra dos Órgãos National Park | 🇧🇷 Brazil | |
| 4 | Manu National Park | 🇵🇪 Peru | |
| 5 | Iguaçu National Park | 🇧🇷 Brazil | |
| 6 | Iguazú National Park | 🇦🇷 Argentina | |
| 7 | Henri Pittier National Park | 🇻🇪 Venezuela |
With luck
About 10% of wildlife watchers report a Large-headed Flatbill sighting in Manu National Park on a given day, based on 226 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 267th most-seen of the 641 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
March, May, July–September and December
In those months about 10% of wildlife watchers report a Large-headed Flatbill in Manu National Park on a given day, against under 5% in January–February, April, June and October–November, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Large-headed Flatbill sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 7 parks where we can rate Large-headed Flatbill sightings, Manu National Park ranks 4th at about 10%, level with the leaders once rounded. The best odds are in Itatiaia National Park (Brazil, about 10%), Tambopata National Reserve (Peru, about 10%) and Serra dos Órgãos National Park (Brazil, about 10%).
GBIF citizen-science records
It is estimated from how often the Large-headed Flatbill is recorded against all the birds logged in Manu National Park (226 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.
