Orthetrum triangulare
In 3 days ~20% in a week ~30%
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 Hangzhou on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 145th most-seen of the 172 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.
June to September
In those months about 10% of wildlife watchers report a Blue-Tailed Forest Hawk in Hangzhou on a given day, against under 5% in October to May, the lowest months. Those are among Hangzhou's wettest months, with about 180 mm of rain a month against 65 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.
6th of 8
Of the 8 cities where we can rate Blue-Tailed Forest Hawk sightings, Hangzhou ranks 6th 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 Hangzhou (genus Orthetrum) are Slender Skimmer (about 10%) and White-Tailed Skimmer (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 Hangzhou (5 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.
