Orsotriaena medus
In 3 days ~40% in a week ~70%
Orsotriaena medus is a butterfly found in south Asia, southeast Asia, and Australia. It is the only species in the genus Orsotriaena, first described by Hans Daniel Johan Wallengren in 1858. The butterfly has historically been called the nigger referring to its dark brown colour, but it has been renamed in Australian faunal works to smooth-eyed bushbrown, medus brown in India, and dark grass-brown in Southeast Asia.
Orsotriaena medus is a medium-sized butterfly with wingspan of 45 to 55 mm (1.8 to 2.2 in). The butterfly is dark brown above with a thin marginal pale border. The upper hindwing having a thin submarginal line. There are no eyespots on the upperside of the wings.
Below, the butterfly has a white discal band which runs across both wings. It has five eyespots on the underside of the wings. In the forewing, it has two eyespots, with the anterior eyespot slightly smaller. In the hindwing, it has two eyespots on the apical region and a separate ocellus in the tornal (hindmost) region. The uppermost of the eyespots in the hindwing are greatly smaller, while the remaining two are more or less of equal sizes.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Namdapha National Park | 🇮🇳 India | |
| 2 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 3 | Chitwan National Park | 🇳🇵 Nepal | |
| 4 | Taman Negara National Park | 🇲🇾 Malaysia | |
| 5 | Khao Sok National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yogyakarta | 🇮🇩 Indonesia | |
| 2 | Kozhikode | 🇮🇳 India | |
| 3 | Tasikmalaya | 🇮🇩 Indonesia | |
| 4 | Jakarta | 🇮🇩 Indonesia | |
| 5 | Kochi | 🇮🇳 India | |
| 6 | Singapore | 🇸🇬 Singapore | |
| 7 | Kuala Lumpur | 🇲🇾 Malaysia |
Possible
About 20% of wildlife watchers report a Smooth-Eyed Bushbrown sighting in Chitwan National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 17th most-seen of the 24 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
November
In that month about 30% of wildlife watchers report a Smooth-Eyed Bushbrown in Chitwan National Park on a given day, against under 5% in February, May–July and September–October, the lowest months. That is one of Chitwan National Park's driest months, with almost no rain against 660 mm in July.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Smooth-Eyed Bushbrown sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 5
Of the 5 parks where we can rate Smooth-Eyed Bushbrown sightings, Chitwan National Park ranks 3rd at about 20%. The best odds are in Namdapha National Park (India, about 40%) and Sinharaja Forest Reserve (Sri Lanka, about 20%). All parks ranked.
Same family: Nymphalidae
The closest relatives of the Smooth-Eyed Bushbrown that you can see in Chitwan National Park (family Nymphalidae, Brush-footed Butterflies) are Grey Pansy (about 30%), Great Eggfly (about 30%) and Peacock Pansy (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Smooth-Eyed Bushbrown is recorded against all the insects logged in Chitwan National Park (7 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.
