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Sticker of Southern black widow
Bug card No. 1251 of 1,500

Southern black widow

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

The southern black widow is a shiny black spider with a round tummy. Underneath, it has a red mark shaped like an hourglass. It is one of the best-known spiders in America. The male is much smaller than the female.

Fun fact: spiders are not insects. Insects have six legs, spiders have eight. Everyone calls them bugs anyway!
Lives in
The southeastern United States, Mexico and the Caribbean
Length
0.3 to 1.3 cm (0.12 to 0.51 in)
the female is 8 to 13 mm, the male 3 to 6 mm
Top speed
about 1.4 km/h (0.87 mph)
On foot, estimate
Can it hurt you?
Dangerous: look, do not touch
What does it eat?
It eats insects, woodlice, millipedes and even other spiders that get stuck in its web.
For real!Photo of Southern black widow
Picture by unknown author. CC BY 2.0, via Wikimedia Commons.

How big is it?

How long is it?

Southern black widow about 1.3 cm long (0.51 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)
as long as 2 grains of rice in a rowcould run across a dinner table in 2.6 secondsmoves 30 times its own body length every second

How big is Southern black widow compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Young black widows do not look like their parents. They are grey with white stripes and yellow and orange spots.

2

Some males are purple.

3

Its web is a messy tangle, but the silk is very strong.

4

A mother can make four to nine egg sacs in one summer, each with 100 to 400 eggs.

5

Females can live for up to three years.

you asked

Most asked questions about Southern black widow

?How can you recognise a black widow?

The female is shiny black with a red hourglass mark on the underside of her round tummy.

?What does a black widow eat?

Mostly insects, but also woodlice, millipedes, centipedes and other spiders caught in its web.

For bug experts

Scientific name
Latrodectus mactans
Named by
Fabricius, 1775
Group
Spiders
Family
Theridiidae
Classification
Arachnida > Araneae > Theridiidae
Lives on
North America
Also known as
Black widow, Shoe-button spider

Where the facts come from

  1. Latrodectus mactans (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 unknown author. CC BY 2.0, 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 hello@bugwiki.app and we will fix it.

More from the same group: Spiders

Also at home here: Gardens and meadows