Heliocypha perforata
In 3 days ~20% in a week ~30%
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 Tuen Mun on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 336th most-seen of the 557 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
April–July and September–November
In those months about 10% of wildlife watchers report a Common Blue Jewel in Tuen Mun on a given day, against under 5% in August 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.
Among the best
Of the 3 cities where we can rate Common Blue Jewel sightings, Tuen Mun ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Hong Kong (China, about 10%).
Same order: Odonata
The closest relatives of the Common Blue Jewel that you can see in Tuen Mun (order Odonata, Dragonflies and Damselflies) are Common Picture Wing (about 30%), Common Flangetail (about 20%) and Slender Skimmer (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 Tuen Mun (11 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.
