Ideopsis similis
In 3 days ~30% in a week ~50%
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 |
With luck
About 10% of wildlife watchers report a Ceylon Blue Glassy Tiger sighting in Tuen Mun on a given day, based on 31 verified sightings from GBIF citizen-science data. It is the 152nd most-seen of the 557 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
May and September
In those months about 20% of wildlife watchers report a Ceylon Blue Glassy Tiger in Tuen Mun on a given day, against under 5% in February and November, the lowest months. Those are among Tuen Mun's wettest months, with about 200 mm of rain a month against 20 mm in December.
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 9
Of the 9 cities where we can rate Ceylon Blue Glassy Tiger sightings, Tuen Mun ranks 3rd at about 10%. The best odds are in Hong Kong (China, about 30%) and Taipei (Taiwan, about 10%).
Same family: Nymphalidae
The closest relatives of the Ceylon Blue Glassy Tiger that you can see in Tuen Mun (family Nymphalidae, Brush-footed Butterflies) are Great Eggfly (about 40%), Dark-Branded Bushbrown (about 30%) and Plain Tiger Butterfly (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 Tuen Mun (31 verified sightings), 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.
