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Silverfish

Lepisma saccharinum

The silverfish is a tiny silvery grey insect with no wings at all. It has long feelers on its head and three thin tails at the back. When it runs, it wiggles just like a little fish swimming, and that is how it got its name.

Lives in
Almost all over the world, in damp corners of houses
Length
0.7 to 1 cm (0.28 to 0.39 in)
Top speed
about 0.91 km/h (0.57 mph)
On foot, estimate
Can it hurt you?
Harmless
Harmless. It does not bite or spread disease, but it can nibble holes in books and wallpaper.
What does it eat?
It nibbles on things with starch and sugar in them, like paper, glue, book covers, crumbs and even dandruff. It can live for a year or more without food if it has water.
For real!Photo of Silverfish
Picture by Christian Fischer. CC BY-SA 3.0, via Wikimedia Commons.

How big is it?

How long is it?

Silverfish about 1 cm long (0.39 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 fingernailas long as 1.5 grains of rice in a rowcould run across a dinner table in 4 secondsmoves 25 times its own body length every second

How big is Silverfish compared to YOU?

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

How fast is it?

cool stuff

Fun facts

1

It loves damp places like bathrooms, basements and kitchens, and it hides from the light.

2

Its scientific name comes from the word for sugar, because it likes sweet and starchy food.

3

If it loses a feeler or one of its tails, it can grow a new one in about four weeks.

4

It keeps shedding its skin even when it is grown up, sometimes 30 times in one year.

5

A baby silverfish is white when it hatches and turns silvery grey as it grows.

you asked

Most asked questions about Silverfish

?Is a silverfish dangerous?

No. It does not bite or carry disease, but it can damage paper, books and wallpaper.

?What do silverfish eat?

Things with starch and sugar, like paper, glue, crumbs and dandruff.

?How big is a silverfish?

Usually about 7 to 10 millimetres long, about as long as your fingernail.

For bug experts

Scientific name
Lepisma saccharinum
Named by
Linnaeus, 1758
Group
Other insects
Family
Lepismatidae
Classification
Insecta > Zygentoma > Lepismatidae
Lives on
Europe, Asia, Africa, North America, South America, Australia and Oceania

Where the facts come from

  1. Silverfish (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 Christian Fischer. 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: Other insects

Also at home here: Houses and farms