Heliocypha perforata
In 3 days ~20% in a week ~40%
Heliocypha perforata, also known by its common name common blue jewel, is a species of damselfly from the genus Heliocypha. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Sok National Park | 🇹🇭 Thailand | |
| 2 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 3 | Khao Yai National Park | 🇹🇭 Thailand |
With luck
About 10% of wildlife watchers report a Common Blue Jewel sighting in Hong Kong on a given day, based on 46 verified sightings from GBIF citizen-science data. It is the 255th most-seen of the 1125 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April–May and July–November
In those months about 10% of wildlife watchers report a Common Blue Jewel in Hong Kong on a given day, against under 5% in June and December–March, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Common Blue Jewel sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Common Blue Jewel sightings, Hong Kong has the highest daily chance: about 10%. Next come Tuen Mun (China, about 10%) and Taipei (Taiwan, under 5%).
Same order: Odonata
The closest relatives of the Common Blue Jewel that you can see in Hong Kong (order Odonata, Dragonflies and Damselflies) 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 Common Blue Jewel is recorded against all the insects logged in Hong Kong (46 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.
