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Sticker of Snake-back spider
Bug card No. 3962 of 4,939

Snake-back spider

Segestria senoculata
Eats: Other bugs and small animalsSpidersGardens and meadows8 legsNot an insect, but a bug cousin

The snake-back spider has a grey body with a row of black spots down its back. People think the pattern looks like the skin of some snakes, and that is how it got its name. It hides in a little silk tube inside a crack.

Fun fact: spiders are not insects. Insects have six legs, spiders have eight. Everyone calls them bugs anyway!
Lives in
Europe and Asia, in cracks in walls, rocks and tree bark
Length
9 mm (0.35 in)
Top speed
about 1.1 km/h (0.68 mph)
On foot, estimate
What does it eat?
It eats small insects that walk past the door of its silk tube.
For real!Photo of Snake-back spider
Picture by Magnefl. CC BY-SA 3.0, via Wikimedia Commons.

How big is it?

How long is it?

Snake-back spider about 9 mm long (0.35 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 3.3 secondsmoves 34 times its own body length every second

How big is Snake-back spider compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Silk threads spread out from the door of its tube like a fan. When an insect touches one, the spider rushes out and grabs it.

2

On some spiders the black spots join together into one long dark stripe.

3

Its legs are pale brown with darker rings, like little striped socks.

4

In Great Britain there is a spider wasp that hunts only this spider.

you asked

Most asked questions about Snake-back spider

?Why is it called the snake-back spider?

Because the row of black spots on its back looks a bit like the pattern on some snakes.

For bug experts

Scientific name
Segestria senoculata
Group
Spiders
Family
Segestriidae
Classification
Arachnida > Araneae > Segestriidae
Lives on
Europe, Asia

Where the facts come from

  1. Segestria senoculata (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 Magnefl. CC BY-SA 3.0, 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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