Ideopsis similis
In 3 days ~60% in a week ~90%
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 30% of wildlife watchers report a Ceylon Blue Glassy Tiger sighting in Sinharaja Forest Reserve on a given day, based on 22 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 19th most-seen of the 117 insects we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
January and March
In those months about 40% of wildlife watchers report a Ceylon Blue Glassy Tiger in Sinharaja Forest Reserve on a given day, against under 5% in April–July and September, the lowest months. Those are among Sinharaja Forest Reserve's driest months, with about 160 mm of rain a month against 490 mm in November.
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.
Yes
Of the 3 parks where we can rate Ceylon Blue Glassy Tiger sightings, Sinharaja Forest Reserve has the highest daily chance: about 30%. Next come Cuc Phuong National Park (Vietnam, about 20%) and Taroko National Park (Taiwan, about 20%).
Same family: Nymphalidae
The closest relatives of the Ceylon Blue Glassy Tiger that you can see in Sinharaja Forest Reserve (family Nymphalidae, Brush-footed Butterflies) are Glad-Eye Bushbrown (about 40%), Clipper (about 40%) and Ceylon Tree Nymph (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 Sinharaja Forest Reserve (22 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.
