Tachycineta leucorrhoa
Silhouette: Andy Wilson · PhyloPic
In 3 days ~80% in a week >90%
The white-rumped swallow (Tachycineta leucorrhoa) is a species of bird in the family Hirundinidae. First described and given its binomial name by French ornithologist Louis Pierre Vieillot in 1817, it was for many years considered a subspecies of the Chilean swallow. The species is monotypic with no known population variations. It has a white supraloral streak, or streak above its lores (the region between a bird's eye and nostrils), which can be used to differentiate it from the Chilean swallow. The lores, ear coverts, tail, and wings are black, with white tips on the inner secondaries, tertials, and greater coverts of the wings. The rest of the upperparts are a glossy blue. Its underparts and underwing-coverts are white, in addition to the rump, as the name suggests. The sexes are similar, and the juvenile is duller and browner with a dusky breast.
This species usually builds its nest in holes in trees or dead snags or under or in artificial structures like fence posts and the eaves of buildings. The white-rumped swallow is solitary and nests in distributed pairs during the breeding season. The breeding season is from October to December in Brazil and from October to February in neighboring Argentina. Usually, only one brood with four to seven eggs is laid, although a second one will occasionally be laid. The female incubates the eggs over a period usually between 15 and 16 days, with the fledging usually occurring between 21 and 25 days after hatching.
This swallow is found in Argentina, Bolivia, Brazil, Paraguay, Peru, and Uruguay. Its natural habitats are: dry savanna, pastureland, the edge of forests, subtropical or tropical seasonally wet or flooded lowland grassland.
It is classified as a least-concern species by the International Union for Conservation of Nature (IUCN). Its population is increasing and it may benefit from the increase in availability of artificial nest sites. The shiny cowbird is an occasional brood parasite of the white-rumped swallow. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Emas National Park | 🇧🇷 Brazil | |
| 2 | Iberá National Park | 🇦🇷 Argentina | |
| 3 | Serra da Canastra National Park | 🇧🇷 Brazil | |
| 4 | El Palmar National Park | 🇦🇷 Argentina | |
| 5 | El Impenetrable National Park | 🇦🇷 Argentina | |
| 6 | Parque Estadual Encontro das Águas | 🇧🇷 Brazil | |
| 7 | Iguaçu National Park | 🇧🇷 Brazil | |
| 8 | Iguazú National Park | 🇦🇷 Argentina | |
| 9 | Serra dos Órgãos National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Buenos Aires | 🇦🇷 Argentina | |
| 2 | Montevideo | 🇺🇾 Uruguay | |
| 3 | Rosario | 🇦🇷 Argentina | |
| 4 | Curitiba | 🇧🇷 Brazil | |
| 5 | Porto Alegre | 🇧🇷 Brazil | |
| 6 | Vitória | 🇧🇷 Brazil | |
| 7 | Campo Grande | 🇧🇷 Brazil | |
| 8 | Salvador | 🇧🇷 Brazil | |
| 9 | São Paulo | 🇧🇷 Brazil | |
| 10 | Asuncion | 🇵🇾 Paraguay |
Likely
About 50% of wildlife watchers report a White-rumped Swallow sighting in Emas National Park on a given day, based on 125 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 36th most-seen of the 187 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.
September
In that month about 70% of wildlife watchers report a White-rumped Swallow in Emas National Park on a given day, against about 30% in March and November, the lowest months. That is one of Emas National Park's driest months, with about 35 mm of rain against 190 mm in January. April and December–February have too few records to rate.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most White-rumped Swallow sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 9 parks where we can rate White-rumped Swallow sightings, Emas National Park has the highest daily chance: about 50%. Next come Iberá National Park (Argentina, about 30%) and Serra da Canastra National Park (Brazil, about 30%).
GBIF citizen-science records
It is estimated from how often the White-rumped Swallow is recorded against all the birds logged in Emas National Park (125 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.
