Bug Wiki
Sticker of Cave spider
Bug card No. 0828 of 4,939

Cave spider

Nesticus cellulanus
Eats: Other bugs and small animalsSpidersHouses and farms8 legsNot an insect, but a bug cousin

The cave spider is a small, pale yellow spider with dark brown markings. It loves dark, damp places, so you might meet it in a cellar. It even has a tiny comb on its back legs.

Fun fact: spiders are not insects. Insects have six legs, spiders have eight. Everyone calls them bugs anyway!
Lives in
Europe and Turkey, and now also North America, in caves, cellars and hollow trees
Length
3 to 6 mm (0.12 to 0.24 in)
females are a little bigger than males
Top speed
about 0.93 km/h (0.58 mph)
On foot, estimate
What does it eat?
It catches insects that crawl into its sticky web.
For real!Photo of Cave spider
Picture by Adrian Tync. CC BY-SA 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Cave spider about 6 mm long (0.24 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 run across a dinner table in 3.9 secondsmoves 43 times its own body length every second

How big is Cave spider compared to YOU?

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

How fast is it?

cool stuff

Fun facts

1

It lives in damp, dark places like caves, mines, cellars, sewers and hollow trees.

2

Its web is a loose platform of sticky threads that catches insects walking by.

3

Cave spiders living in darker places have lighter markings.

4

A male says hello to a female by gently knocking on her web.

5

The babies hatch about 25 to 28 days after the eggs are laid.

you asked

Most asked questions about Cave spider

?Where does the cave spider live?

In dark, damp places such as caves, cellars and hollow trees in Europe, Turkey and North America.

For bug experts

Scientific name
Nesticus cellulanus
Group
Spiders
Family
Nesticidae
Classification
Arachnida > Araneae > Nesticidae
Lives on
Europe, Asia, North America
Also known as
Cavity spider, Comb-footed cellar spider

Where the facts come from

  1. Nesticus cellulanus (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 Adrian Tync. 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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More from the same group: Spiders

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