Ramphotrigon megacephalum
Silhouette: Emily Willoughby · PhyloPic
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Large-headed Flatbill sighting in Iguaçu National Park on a given day, based on 118 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 196th most-seen of the 346 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.
May
In that month about 10% of wildlife watchers report a Large-headed Flatbill in Iguaçu National Park on a given day, against under 5% in June to April, 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.
5th of 7
Of the 7 parks where we can rate Large-headed Flatbill sightings, Iguaçu National Park ranks 5th at under 5%. 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%).
Same family: Tyrannidae
The closest relatives of the Large-headed Flatbill that you can see in Iguaçu National Park (family Tyrannidae, Tyrant Flycatchers) are Great Kiskadee (about 80%), Social Flycatcher (about 40%) and Boat-billed Flycatcher (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Large-headed Flatbill is recorded against all the birds logged in Iguaçu National Park (118 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.
