Ideopsis juventa
In 3 days ~50% in a week ~80%
Ideopsis juventa, the wood nymph, gray glassy tiger or grey glassy tiger, is a species of nymphalid butterfly in the Danainae subfamily. It is found in Southeast Asia. This butterfly is dark gray or black with two rows of circular white dots along the margins of its wings and elongated white patches closer to the body. The elongated white patches appear to radiate from the thorax. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tangkoko Nature Reserve | 🇮🇩 Indonesia | |
| 2 | Bali Barat National Park | 🇮🇩 Indonesia |
Possible
About 20% of wildlife watchers report a Grey Glassy Tiger sighting in Bali Barat National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 8th most-seen of the 13 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.
January
In that month about 40% of wildlife watchers report a Grey Glassy Tiger in Bali Barat National Park on a given day, against under 5% in March–April, August–October and December, the lowest months. That is one of Bali Barat National Park's wettest months, with about 240 mm of rain against 20 mm in August.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Grey Glassy Tiger sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 2 parks where we can rate Grey Glassy Tiger sightings, Bali Barat National Park ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Tangkoko Nature Reserve (Indonesia, about 20%).
Same family: Nymphalidae
The closest relatives of the Grey Glassy Tiger that you can see in Bali Barat National Park (family Nymphalidae, Brush-footed Butterflies) are Brown Pansy (about 20%), Plain Tiger Butterfly (about 20%) and Rustic (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Grey Glassy Tiger is recorded against all the insects logged in Bali Barat National Park (8 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.
