Zygonyx iris
In 3 days ~40% in a week ~70%
Zygonyx iris, the emerald cascader or iridescent stream glider, is a species of dragonfly in the family Libellulidae. It is widespread in many Asian countries. A number of subspecies of Zygonyx iris have been described, but it is not clear if these merely represent extremes of geographical variation or genuine subspecies.
Its thorax has broad humeral stripe in yellow. Its abdomen is black with sides of segments 1 to 3 broadly yellow. There is a yellow mid-dorsal carina from segments 1 to 6. There is a big yellow spot on segment 7. Female is similar to the male.
It breeds in the swift rocky streams. Larva is adapted to cling on rocks. Females lay eggs in first order streams... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Luang National Park | 🇹🇭 Thailand | |
| 2 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 3 | Khao Sok National Park | 🇹🇭 Thailand | |
| 4 | Doi Inthanon National Park | 🇹🇭 Thailand |
Possible
About 20% of wildlife watchers report an Emerald Cascader sighting in Sinharaja Forest Reserve on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 56th most-seen of the 117 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
April
In that month about 40% of wildlife watchers report an Emerald Cascader in Sinharaja Forest Reserve on a given day, against under 5% in January and June–November, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Emerald Cascader 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 4 parks where we can rate Emerald Cascader sightings, Sinharaja Forest Reserve ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Khao Luang National Park (Thailand, about 20%).
Same family: Libellulidae
The closest relatives of the Emerald Cascader that you can see in Sinharaja Forest Reserve (family Libellulidae, Skimmers) are Pied Paddy Skimmer (about 40%), Slender Blue Skimmer (about 30%) and Brown-Backed Red Marsh Hawk (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Emerald Cascader is recorded against all the insects logged in Sinharaja Forest Reserve (11 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.
