Pseudoleistes guirahuro
Silhouette: Sheatherius · PhyloPic
In 3 days ~50% in a week ~80%
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 |
Possible
About 20% of wildlife watchers report a Yellow-rumped Marshbird sighting in Emas National Park on a given day, based on 60 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 90th most-seen of the 187 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 Yellow-rumped Marshbird in Emas National Park on a given day, against about 10% in August and September, the lowest months. April and December–February have too few records to rate.
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.
3rd of 4
Of the 4 parks where we can rate Yellow-rumped Marshbird sightings, Emas National Park ranks 3rd at about 20%. The best odds are in Serra da Canastra National Park (Brazil, about 40%) and Iberá National Park (Argentina, about 40%).
Same family: Icteridae
The closest relatives of the Yellow-rumped Marshbird that you can see in Emas National Park (family Icteridae, New World Blackbirds and Orioles) are Chopí Blackbird (about 70%) and Shiny Cowbird (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yellow-rumped Marshbird is recorded against all the birds logged in Emas National Park (60 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.
