Orthetrum triangulare
In 3 days ~30% in a week ~50%
Orthetrum triangulare is an Asian freshwater dragonfly species. The common name for this species is blue-tailed forest hawk. Two subspecies of Orthetrum triangulare are currently recognised, the nominate subspecies and O. t. malaccense.
It is a medium-sized dragonfly with dark face and bluish eyes. Its thorax is also black with a broad apple green stripe on both sides. Segments 1-2 and 8–10 in the abdomen are black and the remaining segments are pruinosed with azure blue. It is usually found in marshes associated with hill streams where it breeds.
List of odonates of Sri Lanka List of odonates of India List of odonata of Kerala Media related to Orthetrum triangulare at Wikimedia Commons Data related to Orthetrum triangulare at Wikispecies Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Namdapha National Park | 🇮🇳 India | |
| 2 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 3 | Taroko National Park | 🇹🇼 Taiwan | |
| 4 | Khao Yai National Park | 🇹🇭 Thailand | |
| 5 | Kaeng Krachan National Park | 🇹🇭 Thailand |
With luck
About 10% of wildlife watchers report a Blue-Tailed Forest Hawk sighting in Hong Kong on a given day, based on 109 verified sightings from GBIF citizen-science data. It is the 110th most-seen of the 1125 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
May and September
In those months about 20% of wildlife watchers report a Blue-Tailed Forest Hawk in Hong Kong on a given day, against under 5% in November to February, the lowest months. Those are among Hong Kong's wettest months, with about 190 mm of rain a month against 25 mm in December.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Blue-Tailed Forest Hawk sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
4th of 8
Of the 8 cities where we can rate Blue-Tailed Forest Hawk sightings, Hong Kong ranks 4th at about 10%. The best odds are in Dehradun (India, about 30%), Taipei (Taiwan, about 20%) and Nanjing (China, about 10%).
Same genus: Orthetrum
The closest relatives of the Blue-Tailed Forest Hawk that you can see in Hong Kong (genus Orthetrum) are Blue Marsh Hawk (about 30%), Crimson-Tailed Marsh Hawk (about 20%) and Brown-Backed Red Marsh Hawk (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Blue-Tailed Forest Hawk is recorded against all the insects logged in Hong Kong (109 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.
