Monasa flavirostris
Silhouette: Matt Wilkins (Photo by Len Blumin) · PhyloPic
In 3 days ~10% in a week ~20%
The yellow-billed nunbird (Monasa flavirostris) is a species of near-passerine bird in the family Bucconidae, the puffbirds, nunlets, and nunbirds. It is found in Bolivia, Brazil, Colombia, Ecuador, and Peru. The yellow-billed nunbird is monotypic.
The yellow-billed nunbird is 23 to 25 cm (9.1 to 9.8 in) long and weighs about 39 g (1.4 oz). The adult is mostly sooty black, with the belly tending to very dark gray and the tail being greenish black. The lesser wing coverts are mostly white and show as white spots on the closed wing. The bill is yellow and noticeably shorter than those of the other members of its genus. Its eye is dark and the feet blackish. Immatures are a slightly duller black than adults and the white areas are not as prominent.
The yellow-billed nunbird is found in two areas of the upper Amazon Basin. One extends from southeastern Colombia through eastern Ecuador into northern Peru. The other includes eastern Peru, northern Bolivia, and western Brazil as far east as the upper Purus River. The species inhabits somewhat open landscapes such as transitional forest, secondary forest, the edges... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de la Macarena National Park | 🇨🇴 Colombia | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru | |
| 3 | Manu National Park | 🇵🇪 Peru | |
| 4 | Yasuní National Park | 🇪🇨 Ecuador |
Rare
Under 5% of wildlife watchers report a Yellow-billed Nunbird sighting in Yasuní National Park on a given day, based on 86 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 320th most-seen of the 533 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.
February and December
In those months about 10% of wildlife watchers report a Yellow-billed Nunbird in Yasuní National Park on a given day, against under 5% in January and March–November, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Yellow-billed Nunbird sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Yellow-billed Nunbird sightings, Yasuní National Park ranks 4th at under 5%. The best odds are in Sierra de la Macarena National Park (Colombia, about 10%), Tambopata National Reserve (Peru, under 5%) and Manu National Park (Peru, under 5%).
Same genus: Monasa
The closest relatives of the Yellow-billed Nunbird that you can see in Yasuní National Park (genus Monasa, Typical Nunbirds) are Black-fronted Nunbird (about 20%) and White-fronted Nunbird (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yellow-billed Nunbird is recorded against all the birds logged in Yasuní National Park (86 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.
