Orthetrum glaucum
In 3 days ~60% in a week ~90%
Orthetrum glaucum is an Asian dragonfly species, common across much of tropical and subtropical Asia. The common name for this species is blue marsh hawk. It is a medium sized dragonfly with dark face and greenish blue eyes. The thorax of old males are dark blue due to pruinescence. Its wings are transparent with dark amber-yellow tint in the extreme base. Its abdomen is pruinosed with blue color up to segment 8; last two segments are black. The abdomens of females and juvenile males are golden in color, with brown stripes along the sides of the thorax. Despite their visual similarities, females and juvenile males can be distinguished by the shape of their final abdomen segment.
It breeds in marshes associated with forest streams, plantations and canals. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Periyar National Park | 🇮🇳 India | |
| 2 | Danum Valley Conservation Area | 🇲🇾 Malaysia | |
| 3 | Gunung Leuser National Park | 🇮🇩 Indonesia | |
| 4 | Namdapha National Park | 🇮🇳 India | |
| 5 | Kerinci Seblat National Park | 🇮🇩 Indonesia | |
| 6 | Kinabalu Park | 🇲🇾 Malaysia | |
| 7 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 8 | Khao Luang National Park | 🇹🇭 Thailand | |
| 9 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 10 | Khao Yai National Park | 🇹🇭 Thailand | |
| 11 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 12 | Khao Sok National Park | 🇹🇭 Thailand | |
| 13 | Taroko National Park | 🇹🇼 Taiwan | |
| 14 | Taman Negara National Park | 🇲🇾 Malaysia |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hong Kong | 🇨🇳 China | |
| 2 | Dehradun | 🇮🇳 India | |
| 3 | Singapore | 🇸🇬 Singapore | |
| 4 | Tuen Mun | 🇨🇳 China | |
| 5 | Kuala Lumpur | 🇲🇾 Malaysia | |
| 6 | Taichung | 🇹🇼 Taiwan | |
| 7 | Taipei | 🇹🇼 Taiwan | |
| 8 | Xiamen City | 🇨🇳 China | |
| 9 | Guangzhou | 🇨🇳 China | |
| 10 | Bandung | 🇮🇩 Indonesia |
Possible
About 20% of wildlife watchers report a Blue Marsh Hawk sighting in Dehradun on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 15th most-seen of the 73 insects we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
August
In that month about 40% of wildlife watchers report a Blue Marsh Hawk in Dehradun on a given day, against under 5% in April and December–February, the lowest months. That is one of Dehradun's wettest months, with about 370 mm of rain against 5 mm in November.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Blue Marsh Hawk 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 15
Of the 15 cities where we can rate Blue Marsh Hawk sightings, Dehradun ranks 2nd at about 20%. The best odds are in Hong Kong (China, about 30%).
Same genus: Orthetrum
The closest relatives of the Blue Marsh Hawk that you can see in Dehradun (genus Orthetrum) are Blue-Tailed Forest Hawk (about 30%) 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 Blue Marsh Hawk is recorded against all the insects logged in Dehradun (15 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.
