Zygonyx iris
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report an Emerald Cascader sighting in Guangzhou on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 390th most-seen of the 482 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
June and September
In those months about 10% of wildlife watchers report an Emerald Cascader in Guangzhou on a given day, against under 5% in July–August and October–May, the lowest months. Those are among Guangzhou's wettest months, with about 240 mm of rain a month against 30 mm in December.
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.
2nd of 2
Of the 2 cities where we can rate Emerald Cascader sightings, Guangzhou ranks 2nd at under 5%. The best odds are in Hong Kong (China, about 10%).
Same family: Libellulidae
The closest relatives of the Emerald Cascader that you can see in Guangzhou (family Libellulidae, Skimmers) are Russet Percher (about 10%), Wandering Glider (about 10%) and Slender Skimmer (about 10%), 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 Guangzhou (13 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.
