Graphium doson
In 3 days ~60% in a week ~90%
Graphium doson, the common jay, is a black, tropical papilionid (swallowtail) butterfly with pale blue semi-transparent central wing bands that are formed by large spots. There is a marginal series of smaller spots. The underside of wings is brown with markings similar to upperside but whitish in colour. The sexes look alike. The species was first described by father and son entomologists Cajetan and Rudolf Felder.
It is widespread and common throughout Southeast Asia, including lower elevations in Sri Lanka and southern India, Eastern Ghats, Satpuras, Bengal, Assam and Bangladesh, and the Himalayan foothills. The species is however scarce in southern Honshū, Japan. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 2 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 3 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 4 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 5 | Bali Barat National Park | 🇮🇩 Indonesia | |
| 6 | Khao Yai National Park | 🇹🇭 Thailand | |
| 7 | Taroko National Park | 🇹🇼 Taiwan | |
| 8 | Khao Sok National Park | 🇹🇭 Thailand | |
| 9 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia |
Possible
About 30% of wildlife watchers report a Common Jay sighting in Cat Tien National Park on a given day, based on 29 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 23rd most-seen of the 125 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.
March and April
In those months about 40% of wildlife watchers report a Common Jay in Cat Tien National Park on a given day, against under 5% in August–September and December–February, the lowest months. Those are among Cat Tien National Park's driest months, with about 55 mm of rain a month against 490 mm in July.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Common Jay sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 9 parks where we can rate Common Jay sightings, Cat Tien National Park ranks 2nd at about 30%, level with the leaders once rounded. The best odds are in Cuc Phuong National Park (Vietnam, about 30%).
Same genus: Graphium
The closest relatives of the Common 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 Five-Bar Swordtail (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Jay is recorded against all the insects logged in Cat Tien National Park (29 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.
