Cissia eous
In 3 days ~20% in a week ~50%
Cissia eous, locally known as the brown butterfly (Brazilian Portuguese: borboleta marrom), is a butterfly in the family Nymphalidae described by Arthur Gardiner Butler in 1867. It is found in the countries of Brazil, Argentina, Uruguay and Paraguay. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Serra dos Órgãos National Park | 🇧🇷 Brazil | |
| 2 | Iguazú National Park | 🇦🇷 Argentina | |
| 3 | Iguaçu National Park | 🇧🇷 Brazil | |
| 4 | Tijuca National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | São Paulo | 🇧🇷 Brazil | |
| 2 | Campinas | 🇧🇷 Brazil | |
| 3 | Porto Alegre | 🇧🇷 Brazil | |
| 4 | Vitória | 🇧🇷 Brazil | |
| 5 | Belo Horizonte | 🇧🇷 Brazil | |
| 6 | Niterói | 🇧🇷 Brazil | |
| 7 | Rio de Janeiro | 🇧🇷 Brazil |
With luck
About 10% of wildlife watchers report a Cissia eous sighting in Iguaçu National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 144th most-seen of the 279 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
October and December
In those months about 20% of wildlife watchers report a Cissia eous in Iguaçu National Park on a given day, against under 5% in January–March and July–September, the lowest months. Those are among Iguaçu National Park's wettest months, with about 230 mm of rain a month against 100 mm in August.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Cissia eous 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 Cissia eous sightings, Iguaçu National Park ranks 3rd at about 10%. The best odds are in Serra dos Órgãos National Park (Brazil, about 20%) and Iguazú National Park (Argentina, about 10%).
Same family: Nymphalidae
The closest relatives of the Cissia eous that you can see in Iguaçu National Park (family Nymphalidae, Brush-footed Butterflies) are Agathina Emperor (about 70%), Hydaspes Eighty-Eight (about 50%) and Orange Mapwing (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Cissia eous is recorded against all the insects logged in Iguaçu National Park (11 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.
