Ideopsis similis
In 3 days ~50% in a week ~80%
Ideopsis similis, the Ceylon blue glassy tiger, is a species of butterfly found in Asia, including Sri Lanka, India and Taiwan, that belongs to the subfamily Danainae (crows and tigers), in the family Nymphalidae (brush-footed butterflies). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 2 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 3 | Taroko National Park | 🇹🇼 Taiwan |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hong Kong | 🇨🇳 China | |
| 2 | Taipei | 🇹🇼 Taiwan | |
| 3 | Tuen Mun | 🇨🇳 China | |
| 4 | Ho Chi Minh City | 🇻🇳 Vietnam | |
| 5 | Colombo [Sri Jayawardenepura Kotte] | 🇱🇰 Sri Lanka | |
| 6 | Kaohsiung | 🇹🇼 Taiwan | |
| 7 | Kuala Lumpur | 🇲🇾 Malaysia | |
| 8 | Bangkok | 🇹🇭 Thailand | |
| 9 | Guangzhou | 🇨🇳 China |
Possible
About 20% of wildlife watchers report a Ceylon Blue Glassy Tiger sighting in Taroko National Park on a given day, based on 33 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 54th most-seen of the 447 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
February
In that month about 40% of wildlife watchers report a Ceylon Blue Glassy Tiger in Taroko National Park on a given day, against about 10% in January, May–June, August and October, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Ceylon Blue Glassy Tiger 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 3
Of the 3 parks where we can rate Ceylon Blue Glassy Tiger sightings, Taroko National Park ranks 3rd at about 20%. The best odds are in Sinharaja Forest Reserve (Sri Lanka, about 30%) and Cuc Phuong National Park (Vietnam, about 20%).
Same family: Nymphalidae
The closest relatives of the Ceylon Blue Glassy Tiger that you can see in Taroko National Park (family Nymphalidae, Brush-footed Butterflies) are Yellow Emperor (about 40%), Common Palmfly (about 30%) and Common Mapwing (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Ceylon Blue Glassy Tiger is recorded against all the insects logged in Taroko National Park (33 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.
