Casiornis rufus
Silhouette: Emily Willoughby · PhyloPic
In 3 days <5% in a week ~10%
The rufous casiornis (Casiornis rufus) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Brazil, Paraguay, Peru, Uruguay, and as a vagrant to Chile. The rufous casiornis was originally described as Thamnophilus rufus, mistakenly placing it in the "typical antbird" family Thamnophilidae. It was later moved to genus Casiornis that was erected in 1856. During the first half of the twentieth century many authors placed that genus in family Cotingidae but starting in the 1970s it was recognized as belonging to Tyrannidae. The rufous casiornis shares the genus with the ash-throated casiornis (C. fuscus) and the two form a superspecies. For a time they were treated as conspecific but early in the twenty-first century they were firmly established as separate species.
The rufous casiornis is monotypic. The rufous casiornis is 17 to 18 cm (6.7 to 7.1 in) long and weighs 22 to 27 g (0.78 to 0.95 oz). The sexes have the same plumage. Adults have a rufous head, upperparts, wings, and tail. Their throat and breast are cinnamon with a whitish middle of the throat. Their belly is pale buffy yellowish... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | El Impenetrable National Park | 🇦🇷 Argentina | |
| 2 | Emas National Park | 🇧🇷 Brazil | |
| 3 | Serra da Canastra National Park | 🇧🇷 Brazil | |
| 4 | Parque Estadual Encontro das Águas | 🇧🇷 Brazil | |
| 5 | Amboró National Park | 🇧🇴 Bolivia | |
| 6 | Chapada dos Guimarães National Park | 🇧🇷 Brazil | |
| 7 | Iberá National Park | 🇦🇷 Argentina |
Rare
Under 5% of wildlife watchers report a Rufous Casiornis sighting in Chapada dos Guimarães National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 225th most-seen of the 273 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
May
In that month about 10% of wildlife watchers report a Rufous Casiornis in Chapada dos Guimarães National Park on a given day, against under 5% in June to January, the lowest months. That is one of Chapada dos Guimarães National Park's driest months, with about 30 mm of rain against 240 mm in March. February to April have too few records to rate.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Rufous Casiornis sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
6th of 7
Of the 7 parks where we can rate Rufous Casiornis sightings, Chapada dos Guimarães National Park ranks 6th at under 5%. The best odds are in El Impenetrable National Park (Argentina, about 20%), Emas National Park (Brazil, about 10%) and Serra da Canastra National Park (Brazil, about 10%).
Same family: Tyrannidae
The closest relatives of the Rufous Casiornis that you can see in Chapada dos Guimarães National Park (family Tyrannidae, Tyrant Flycatchers) are Great Kiskadee (about 70%), Boat-billed Flycatcher (about 40%) and Rusty-margined Flycatcher (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rufous Casiornis is recorded against all the birds logged in Chapada dos Guimarães National Park (12 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.
