Blue Marsh Hawk
Orthetrum glaucum
The Blue Marsh Hawk is a master of the skies, easily recognized by the stunning powdery blue coating on the male's body. A common sight near Asian wetlands, this robust dragonfly is a fascinating garden visitor for anyone with a backyard pond.
Quick Identification
Size
Body length of 44–50 mm (1.7–2 in); wingspan of 70–80 mm (2.8–3.1 in)
Colors
Mature males are a deep powdery blue (pruinose) with dark amber hindwing bases. Females and juveniles are olive-brown with black markings.
Key Features
- Deep blue pruinescence on mature male thorax and abdomen
- Dark amber/brown spot at the base of the hindwings
- Black-tipped abdomen in sub-adults
- Robust body with a broad abdomen compared to other skimmers
When You’ll See Them
Geographic range
Where Does the Blue Marsh Hawk Live?
Native to the vast landscapes of Asia, the Blue Marsh Hawk thrives across a wide longitudinal stretch from the Indian subcontinent and Sri Lanka through the tropical forests of Southeast Asia. Its core range includes countries such as Thailand, Malaysia, and Indonesia, extending northward into Southern China, Taiwan, and the Japanese islands. While primarily a tropical species, it is highly adaptable and can be found in both lowland marshes and hilly montane regions.
Basemap © OpenStreetMap contributors
Behavior
The Blue Marsh Hawk is a quintessential 'percher,' a dragonfly that spends a significant portion of its day sitting on a prominent twig, stone, or leaf near the water's edge. From these vantage points, it keeps a keen eye on its territory, darting out with explosive speed to intercept flying prey or to chase away rival males. They are known for their high site fidelity, often returning to the exact same perch after a successful hunt.
While they are formidable predators of the insect world, they are generally oblivious to humans who move slowly. In garden settings, they are most active during the warmest parts of the day, using the sunlight to fuel their high-energy flight. Unlike some more nomadic species, a Blue Marsh Hawk will often stake out a small pond or a section of a stream and defend it vigorously for several days or weeks.
EverydayEarth exclusive
Camera Tips
To capture the Blue Marsh Hawk on a backyard or trail camera, focus your efforts on 'perch spots.' These dragonflies are creatures of habit; look for a single protruding stick, a tall reed, or a sun-baked rock near the edge of a pond. Place your camera on a tripod or mount about 2 to 3 feet (0.6–1 meter) away from these spots. Because dragonflies are small, you will need a camera with a good macro focus or a 'close-focus' setting to ensure the AI can identify the intricate wing veining and blue pruinescence.
Angle is everything with this species. To highlight the signature blue color of the male, position your camera so the sun is behind it, illuminating the dragonfly's back. However, if you want to capture the transparency and texture of the wings, side-lighting during the golden hours of the morning (9–10 AM) is best. Avoid pointing the camera directly at reflective water surfaces to prevent glare from triggering false motions or washing out the subject.
Since these are cold-blooded insects, they are most active when the sun is high. Set your camera's burst mode to high speed; dragonflies take off and land in fractions of a second. If your camera allows for shutter speed adjustments, aim for 1/1000s or faster to freeze the wing motion. You can 'bait' them indirectly by ensuring your garden pond has a variety of flat stones and vertical sticks for them to choose from as hunting stations.
Frequently Asked Questions
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