Graphium eurypylus
In 3 days ~30% in a week ~50%
Graphium eurypylus, the great jay or pale green triangle, is a species of tropical butterfly belonging to the family Papilionidae. The specific name eurypylus likely comes from the name Eurypylus, a Thessalian king who lead the Thessalians during the Trojan War.
This species can be found in the Australasian realm and in the Indomalayan realm (Northeast India, Southeast Asia and Australia). Graphium eurypylus has a wingspan reaching about 7–8 centimetres (2.8–3.1 in). The basic colour of the uppersides of the wings is black, with a chain of yellowish or greenish spots at the edges. In the middle of the forewings there is a large yellowish or greenish area. The undersides of the wings are similar to the uppersides, but the basic colour is brownish and the spots are paler or whitish. The hindwings have a few red spots.
Subspecies G. e. jason (South India and Sri Lanka) — Males and females. Upperside black. Forewing: three slender, oblique, short pale green streaks in basal half of cell and two irregular small similarly-coloured spots near its apex; a discal band composed of pale green spots that gradually diminish in size anteriorly... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 2 | Tangkoko Nature Reserve | 🇮🇩 Indonesia | |
| 3 | Kakadu National Park | 🇦🇺 Australia | |
| 4 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 5 | Lamington National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Great Jay sighting in Cat Tien National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 108th most-seen of the 125 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.
April
In that month about 30% of wildlife watchers report a Great Jay in Cat Tien National Park on a given day, against under 5% in July to March, the lowest months. That is one of Cat Tien National Park's driest months, with about 80 mm of rain against 490 mm in July.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Great Jay sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
4th of 5
Of the 5 parks where we can rate Great Jay sightings, Cat Tien National Park ranks 4th at about 10%. The best odds are in Cuc Phuong National Park (Vietnam, about 30%), Tangkoko Nature Reserve (Indonesia, about 20%) and Kakadu National Park (Australia, about 20%).
Same genus: Graphium
The closest relatives of the Great Jay that you can see in Cat Tien National Park (genus Graphium, Swordtails, Jays, Bluebottles and allies) are Chain Swordtail (about 30%), Tailed Jay (about 30%) and Common Jay (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Great Jay is recorded against all the insects logged in Cat Tien 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.
