Nessaea aglaura
In 3 days ~10% in a week ~30%
Nessaea aglaura, the common olivewing, northern nessaea or Aglaura olivewing, is a species of butterfly of the family Nymphalidae. It is found from Mexico to Panama, Ecuador, Venezuela and Colombia. It is found in evergreen tropical forest and in semi-deciduous tropical forest.
The length of the wings is 31–34 mm for males and 28–36 mm for females. Adults are on wing nearly year round. They are notable for the presence of blue pigments in their wings, as opposed to blue created by physical structures.
The larvae feed on Alchornea costaricensis and Plukenetia volubilis. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Braulio Carrillo National Park | 🇨🇷 Costa Rica | |
| 2 | Tenorio Volcano National Park | 🇨🇷 Costa Rica | |
| 3 | Arenal Volcano National Park | 🇨🇷 Costa Rica |
Rare
Under 5% of wildlife watchers report a Common Olivewing sighting in Arenal Volcano National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 256th most-seen of the 302 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
April, September–October and December–January
In those months about 10% of wildlife watchers report a Common Olivewing in Arenal Volcano National Park on a given day, against under 5% in February–March, May–August and November, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Common Olivewing sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
3rd of 3
Of the 3 parks where we can rate Common Olivewing sightings, Arenal Volcano National Park ranks 3rd at under 5%. The best odds are in Braulio Carrillo National Park (Costa Rica, about 10%) and Tenorio Volcano National Park (Costa Rica, about 10%).
Same family: Nymphalidae
The closest relatives of the Common Olivewing that you can see in Arenal Volcano National Park (family Nymphalidae, Brush-footed Butterflies) are Banded Peacock (about 30%), Banded Owl-Butterfly (about 20%) and Julia Heliconian (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Olivewing is recorded against all the insects logged in Arenal Volcano National Park (5 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.
