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Sticker of Sneaky elf
Bug card No. 3966 of 4,939

Sneaky elf

Pyropyga decipiens

The sneaky elf is a small firefly from eastern North America. But here is the surprise: it cannot light up at all. It is busy in the daytime instead of at night, a flat little beetle with black wing cases.

Lives in
Eastern North America, from Tennessee up to eastern Canada
Length
5 to 8 mm (0.2 to 0.31 in)
Top speed
about 2.4 km/h (1.5 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless. It cannot bite or sting you.
What does it eat?
Firefly young are little hunters of soft creatures in the soil. Not much is known about what the grown-ups eat.
For real!Photo of Sneaky elf
Picture by Jacy Lucier. CC BY-SA 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Sneaky elf about 8 mm long (0.31 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)
small enough to sit on your fingernailcould fly across a whole football pitch in 160 secondsmoves 83 times its own body length every second

How big is Sneaky elf compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

How fast is it?

cool stuff

Fun facts

1

Unlike most fireflies, it has no glowing lantern on its tail.

2

It is active during the day, so it does not need a light to find a partner.

3

Its shield behind the head is mostly black with stripes.

4

It is easily mixed up with two very similar fireflies, but it is the most common of them in the north.

you asked

Most asked questions about Sneaky elf

?Does the sneaky elf firefly glow?

No. Unlike most fireflies, it has no light at all.

?How big is the sneaky elf firefly?

About 5 to 8 millimetres long, smaller than a fingernail.

Myth buster

Myth: All fireflies light up at night.

Truth: Not all of them. The sneaky elf has no light at all and is busy in the daytime instead.

For bug experts

Scientific name
Pyropyga decipiens
Group
Beetles
Family
Lampyridae
Classification
Insecta > Coleoptera > Lampyridae
Lives on
North America
Also known as
Sneaky elf firefly

Where the facts come from

  1. Pyropyga decipiens (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 Jacy Lucier. CC BY-SA 4.0, Wikimedia Commons. The sticker of this bug is drawn from this 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.

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