Circus buffoni
Silhouette: Shyamal · PhyloPic
In 3 days ~20% in a week ~40%
The long-winged harrier (Circus buffoni) is a common bird of prey species endemic to South America. They are members of the family Accipitridae, under the genus Circus which encompasses other harrier species. Its range encompasses most of South America, in grassland and wetland all across the continent. The long-winged harrier is a carnivorous bird, and will feed on many different animals found in its habitat.
Like owls and other harrier species, the long-winged harrier has a distinctive facial disc, which is used to triangulate the bird's hearing while it is hunting. The long-winged harrier is classified as a species of least concern by the IUCN Red List, however their population has been observed to decline due to habitat degradation by human activity.
The long-winged harrier was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with the falcons, eagles and their relatives in the genus Falco and coined the binomial name Falco buffoni. Gmelin based his description on the "Cayenne ringtail" that had been described in 1781 by the English ornithologist John Latham... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Iberá National Park | 🇦🇷 Argentina | |
| 2 | Caroni Swamp | 🇹🇹 Trinidad and Tobago | |
| 3 | Emas National Park | 🇧🇷 Brazil | |
| 4 | Parque Estadual Encontro das Águas | 🇧🇷 Brazil | |
| 5 | Chapada Diamantina National Park | 🇧🇷 Brazil | |
| 6 | Iguaçu National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Curitiba | 🇧🇷 Brazil | |
| 2 | Cochabamba | 🇧🇴 Bolivia | |
| 3 | Buenos Aires | 🇦🇷 Argentina | |
| 4 | Porto Alegre | 🇧🇷 Brazil | |
| 5 | Campo Grande | 🇧🇷 Brazil | |
| 6 | Asuncion | 🇵🇾 Paraguay | |
| 7 | São Paulo | 🇧🇷 Brazil |
With luck
About 10% of wildlife watchers report a Long-winged Harrier sighting in Parque Estadual Encontro das Águas on a given day, based on 125 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 153rd most-seen of the 308 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June and August
In those months about 10% of wildlife watchers report a Long-winged Harrier in Parque Estadual Encontro das Águas on a given day, against under 5% in May, July and September–December, the lowest months. Those are among Parque Estadual Encontro das Águas's driest months, with about 15 mm of rain a month against 190 mm in January. January to April have too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Long-winged Harrier sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 6
Of the 6 parks where we can rate Long-winged Harrier sightings, Parque Estadual Encontro das Águas ranks 4th at about 10%. The best odds are in Iberá National Park (Argentina, about 40%), Caroni Swamp (Trinidad and Tobago, about 30%) and Emas National Park (Brazil, about 30%).
Same family: Accipitridae
The closest relatives of the Long-winged Harrier that you can see in Parque Estadual Encontro das Águas (family Accipitridae, Hawks, Eagles, and Kites) are Roadside Hawk (about 70%), Great Black-Hawk (about 70%) and Black-collared Hawk (about 70%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Long-winged Harrier is recorded against all the birds logged in Parque Estadual Encontro das Águas (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.
