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Sticker of Hawaiian happy-face spider
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Hawaiian happy-face spider

Theridion grallator
Eats: Other bugs and small animalsSpidersRainforests and jungles8 legsNot an insect, but a bug cousin

The Hawaiian happy-face spider is a tiny spider with a see-through yellow body and long, thin legs. Some of them have red and black marks on their back that look just like a smiley face. Every one can look a little different.

Fun fact: spiders are not insects. Insects have six legs, spiders have eight. Everyone calls them bugs anyway!
Lives in
Only on the Hawaiian Islands
Length
5 mm (0.2 in)
Top speed
about 0.85 km/h (0.53 mph)
On foot, estimate
What does it eat?
It catches small insects to eat. What it eats can even change its colour for a while.
For real!Photo of Hawaiian happy-face spider
Picture by Nate Yuen. CC BY 3.0, via Wikimedia Commons.

How big is it?

How long is it?

Hawaiian happy-face spider about 5 mm long (0.2 in)A grain of rice about 6 mm (0.24 in)
small enough to sit on your fingernailcould run across a dinner table in 4.2 secondsmoves 47 times its own body length every second

How big is Hawaiian happy-face spider compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Its body can turn green or orange for a while, depending on what it has just eaten.

2

Not every happy-face spider smiles. Most of them are plain yellow, and the patterns look different from island to island.

3

Having lots of different looks helps it hide from birds, because a bird looking for one kind of spider may miss the others.

4

Its body is so clear that you can almost see through it.

5

Some have a white pattern, made from a kind of waste the spider stores under its skin instead of getting rid of it.

you asked

Most asked questions about Hawaiian happy-face spider

?Why does it have a smiley face?

The face is just a colour pattern on its back. Different patterns may help it hide from hungry birds.

?How big is the happy-face spider?

Its body is less than 5 millimetres long, smaller than a grain of rice.

For bug experts

Scientific name
Theridion grallator
Group
Spiders
Family
Theridiidae
Classification
Arachnida > Araneae > Theridiidae
Lives on
Australia and Oceania

Where the facts come from

  1. Theridion grallator (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 Nate Yuen. CC BY 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: Spiders

Also at home here: Rainforests and jungles