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Sticker of Common blue damselfly
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Common blue damselfly

Enallagma cyathigerum

The common blue damselfly is a thin, bright sky blue insect with black markings. It looks like a tiny, delicate dragonfly. Males are blue, while females can be blue, brown or greenish.

Lives in
Europe, Asia and parts of North America, around ponds, lakes and fens
Length
2.9 to 3.6 cm (1.1 to 1.4 in)
Top speed
about 10 km/h (6.2 mph)
Flying, estimate
Can it hurt you?
Harmless
Completely harmless. It cannot bite or sting people.
What does it eat?
It hunts small insects. Its babies live underwater among the plants and catch even smaller creatures there.
For real!Photo of Common blue damselfly
Picture by Zampel. CC BY-SA 3.0, via Wikimedia Commons.

How big is it?

How long is it?

Common blue damselfly about 3.6 cm long (1.4 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)A banana about 18 cm (7.1 in)
as long as 6 grains of rice in a rowcould fly across a whole football pitch in 38 secondsmoves 77 times its own body length every second

How big is Common blue damselfly compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Each of its wings is about 2 centimetres long.

2

On the side of its body it has just one small black stripe, while other blue damselflies have two.

3

Some females look like the blue males and others are brown or green, which helps them get less attention from the males.

4

Its babies shoot out a special lower lip to grab their food.

5

In cold northern places its babies grow more slowly, so the adults there end up bigger.

you asked

Most asked questions about Common blue damselfly

?What is the difference between a damselfly and a dragonfly?

Damselflies like this one are thinner and more delicate than most dragonflies.

?Is the common blue damselfly dangerous?

No. It is completely harmless to people.

?How big is the common blue damselfly?

It is about 3 to 3.5 centimetres long.

For bug experts

Scientific name
Enallagma cyathigerum
Group
Dragonflies and damselflies
Family
Coenagrionidae
Classification
Insecta > Odonata > Coenagrionidae
Lives on
Europe, Asia, North America
Also known as
Common bluet

Where the facts come from

  1. Enallagma cyathigerum (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
  2. Picture by Zampel. CC BY-SA 3.0, Wikimedia Commons. The round sticker of this bug is cut from the same picture.

If we got something wrong, sorry, we are bug fans, not a science journal. Tell us at [email protected] and we will fix it.

More from the same group: Dragonflies and damselflies

Also at home here: Ponds, rivers and shores