Zygonyx iris
In 3 days ~10% in a week ~30%
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 |
With luck
About 10% of wildlife watchers report an Emerald Cascader sighting in Hong Kong on a given day, based on 29 verified sightings from GBIF citizen-science data. It is the 352nd most-seen of the 1125 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
February–March and June–August
In those months about 10% of wildlife watchers report an Emerald Cascader in Hong Kong on a given day, against under 5% in April–May and September–January, 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.
Yes
Of the 2 cities where we can rate Emerald Cascader sightings, Hong Kong has the highest daily chance: about 10%. Next come Guangzhou (China, under 5%).
Same family: Libellulidae
The closest relatives of the Emerald Cascader that you can see in Hong Kong (family Libellulidae, Skimmers) are Blue Marsh Hawk (about 30%), Indigo Dropwing (about 20%) and Crimson-Tailed Marsh Hawk (about 20%), 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 Hong Kong (29 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.
