Northern Bluet
Insects diurnal

Northern Bluet

Enallagma annexum

A masterpiece of biological engineering in miniature, the Northern Bluet dazzles with its electric blue segments and delicate flight. These common but stunning damselflies are the vibrant sentinels of North American wetlands.

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Quick Identification

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Size

26–38 mm (1.0–1.5 inches) in length; wingspan approximately 35–45 mm (1.4–1.8 inches)

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Colors

Males are vibrant sky-blue with black bands and a mushroom-shaped spot; females are dimorphic, appearing either pale blue or olive-tan with heavy black markings

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Key Features

  • Large blue post-ocular spots on the head
  • Mushroom-shaped black spot on the second abdominal segment (males)
  • Wings held together vertically or slightly tilted over the back when resting
  • Bright blue and black ringed abdomen

When You’ll See Them

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Activity pattern diurnal
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Peak hours 10 AM - 4 PM
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Season May-August
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Diet Carnivorous; hunts small soft-bodied insects such as mosquitoes, gnats, midges, and small flies
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Habitat Lakes, ponds, marshes, and slow-moving streams with abundant shoreline vegetation

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Behavior

Northern Bluets are quintessential 'pond damselflies,' known for their low, fluttering flight patterns over the surface of still water. Unlike their dragonfly cousins, they are relatively dainty flyers, preferring to spend much of their time perched on emergent vegetation like reeds or lily pads. They are highly territorial during the breeding season, with males patrolling small stretches of shoreline to ward off rivals and wait for receptive females.

When hunting, they use their large compound eyes to spot tiny movements in the air, darting out to snatch gnats and mosquitoes mid-flight. They are also known for 'gleaning,' or picking small insects directly off leaves. To humans, they are harmless and often quite curious, sometimes landing on a quiet observer's hand or fishing rod if it provides a sunny vantage point. At night or during rain, they retreat into tall grasses surrounding the water to find shelter.

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Camera Tips

Capturing high-quality images of Northern Bluets requires focusing on their 'launch pads.' These damselflies are creatures of habit and will often return to the exact same reed or twig after a hunting flight. Position your camera on a tripod at a low angle, roughly 12 to 24 inches above the water level, aimed at a prominent piece of vegetation that stands out from the rest. Because they are small, use a macro setting or a lens with a short minimum focus distance to ensure the AI can lock onto the blue coloration.

Lighting is your best friend when photographing Odonata. Try to position your camera so the sun is behind you or at a 45-degree angle to the side. This illuminates the brilliant blue segments of the male and the intricate, lace-like venation of the wings. If you are using a trail camera, look for models with a 'Close-Up' or 'Macro' lens attachment, as standard trail cams often have a fixed focus starting at 5 feet, which is too far for a 1-inch insect. Set your trigger speed to the fastest possible setting, or better yet, use a high-frame-rate video mode to capture their delicate take-offs.

If you don't have a natural pond, you can attract them to a specific spot by placing a 'perching stake'—a simple bamboo garden stake or a dry branch—in a sunny part of your yard near a water feature. Northern Bluets seek out these high points to survey for prey and mates. In terms of timing, the 'golden hour' for damselfly photography isn't sunrise, but rather the mid-morning when they are warming up. As they transition from their sluggish morning state to full activity, they will often sit still for longer periods with their wings spread slightly, providing the perfect window for a clear, sharp identification photo.

Frequently Asked Questions

Northern Bluet are most active during the warmest part of the day, typically between 10:00 AM and 4:00 PM, when the sun provides the thermal energy they need for flight.
The best way to attract Northern Bluet is to install a backyard pond with native aquatic plants like sedges and water lilies, which provide essential perching and breeding sites.
They are beneficial predators that eat a variety of small insects, including mosquitoes, midges, and gnats, making them great natural pest controllers.
Yes, Northern Bluet are very adaptable and can be found in suburban gardens, parks, and even near swimming pools if there is a natural wetland or pond nearby.
Look for the mushroom-shaped black mark on the second abdominal segment of the male and the large blue spots behind the eyes; other 'bluets' have differently shaped markings.

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