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Sticker of Western black widow
Bug card No. 1433 of 1,500

Western black widow

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

The western black widow is a shiny black spider. The female often has a red mark shaped like an hourglass on her tummy. The male is much smaller and light brown with stripes. It builds a messy, tangled web instead of a neat round one.

Fun fact: spiders are not insects. Insects have six legs, spiders have eight. Everyone calls them bugs anyway!
Lives in
Western North America, from southern Canada to Mexico
Length
0.7 to 1.6 cm (0.28 to 0.63 in)
the female is 14 to 16 mm, the male about half that
Top speed
about 1.5 km/h (0.93 mph)
On foot, estimate
Can it hurt you?
Dangerous: look, do not touch
What does it eat?
It eats insects that get caught in its web.
For real!Photo of Western black widow
Picture by Dllu. CC BY-SA 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Western black widow about 1.6 cm long (0.63 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)
as long as 2.5 grains of rice in a rowcould run across a dinner table in 2.4 secondsmoves 26 times its own body length every second

How big is Western black widow compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

The mark on its tummy is usually red, but it can also be yellow and, very rarely, white.

2

It likes to hang upside down near the middle of its web, waiting for insects.

3

Its web has no neat pattern at all. The threads go every which way.

4

To say hello, the male taps on the female's web threads with his feet.

5

The male is only about half as long as the female.

you asked

Most asked questions about Western black widow

?How big is a western black widow?

The female's body is about 14 to 16 millimetres long, and the male is about half that size.

?Where does the western black widow live?

In the western part of North America, from southern Canada down to Mexico.

For bug experts

Scientific name
Latrodectus hesperus
Group
Spiders
Family
Theridiidae
Classification
Arachnida > Araneae > Theridiidae
Lives on
North America
Also known as
Western widow

Where the facts come from

  1. Latrodectus hesperus (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 Dllu. CC BY-SA 4.0, 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: Spiders

Also at home here: Gardens and meadows