Eresia nauplius
In 3 days ~30% in a week ~60%
Eresia nauplius, the Peruvian crescent or Nauplius crescent, is a butterfly of the family Nymphalidae. It was described by William Chapman Hewitson in 1852. It is found in most of the Amazon region. The habitat consists of forest edges with low vegetation, including river banks, forest clearings, glades and roadsides.
The wingspan is about 45 mm. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manu National Park | 🇵🇪 Peru | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru | |
| 3 | Yasuní National Park | 🇪🇨 Ecuador |
With luck
About 10% of wildlife watchers report a Nauplius Crescent sighting in Manu National Park on a given day, based on 21 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 53rd most-seen of the 366 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
March and December–January
In those months about 20% of wildlife watchers report a Nauplius Crescent in Manu National Park on a given day, against under 5% in April and August–September, the lowest months. Those are among Manu National Park's wettest months, with about 240 mm of rain a month against 60 mm in August.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Nauplius Crescent sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 parks where we can rate Nauplius Crescent sightings, Manu National Park has the highest daily chance: about 10%. Next come Tambopata National Reserve (Peru, about 10%) and Yasuní National Park (Ecuador, about 10%).
Same genus: Eresia
The closest relatives of the Nauplius Crescent that you can see in Manu National Park (genus Eresia) are Tiger Crescent (about 10%) and Clio Crescent (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Nauplius Crescent is recorded against all the insects logged in Manu National Park (21 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.
