Pseudoleistes guirahuro
Silhouette: Sheatherius · PhyloPic
In 3 days ~80% in a week >90%
The yellow-rumped marshbird (Pseudoleistes guirahuro) is a species of bird in the family Icteridae, the oropendolas, New World orioles, and New World blackbirds. It is found in Argentina, Brazil, Paraguay, and Uruguay. The yellow-rumped marshbird was formally described in 1819 with the binomial Agelaius virescens. It now shares the genus Pseudoleistes with the brown-and-yellow marshbird (P. virescens).
The yellow-rumped marshbird is monotypic. Male yellow-rumped marshbirds average 25.5 cm (10 in) long. Males weigh an average of 91.2 g (3.2 oz) and females average 81.9 g (2.9 oz). The sexes have the same plumage. Adults have a blackish brown head, neck, and upper breast. Their upperparts are mostly brown with a rich yellow rump. Their wings are mostly brown with rich yellow median and lesser coverts that show as an epaulet. Their tail is brown. Their lower breast and belly are rich yellow and their undertail coverts brown with thin yellow edges. Both sexes have a brown iris, a blackish bill, and blackish legs and feet. Juveniles are similar to adults but have browner upperparts with paler edges on some feathers, a yellowish throat, and... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Serra da Canastra National Park | 🇧🇷 Brazil | |
| 2 | Iberá National Park | 🇦🇷 Argentina | |
| 3 | Emas National Park | 🇧🇷 Brazil | |
| 4 | Itatiaia National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Curitiba | 🇧🇷 Brazil | |
| 2 | Campinas | 🇧🇷 Brazil | |
| 3 | São Paulo | 🇧🇷 Brazil | |
| 4 | Campo Grande | 🇧🇷 Brazil |
Likely
About 40% of wildlife watchers report a Yellow-rumped Marshbird sighting in Iberá National Park on a given day, based on 665 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 51st most-seen of the 284 birds we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
January, April and October
In those months about 50% of wildlife watchers report a Yellow-rumped Marshbird in Iberá National Park on a given day, against about 20% in March and July–August, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Yellow-rumped Marshbird 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 4 parks where we can rate Yellow-rumped Marshbird sightings, Iberá National Park ranks 2nd at about 40%, level with the leaders once rounded. The best odds are in Serra da Canastra National Park (Brazil, about 40%).
GBIF citizen-science records
It is estimated from how often the Yellow-rumped Marshbird is recorded against all the birds logged in Iberá National Park (665 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.
