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World’s Deadliest Spiders: The Top 10 Most Venomous Arachnids

By: James Cutmore
Originally Published in  
Science Focus
Close-up of a spider showing two fangs, each with a drop of venom
© Getty
Vocabulary

Aggressive (adjective): Ready to attack or fight.

Nocturnal (adjective): Active at night.

Toxic (adjective): Poisonous or harmful.

Paralyze (verb): To stop movement or feeling in part of the body.

Spiders are often feared for their creepy looks and quick moves. But did you know that most spiders aren’t dangerous to humans? Only a few have venom that can cause real harm. Here are the top 10 most venomous spiders in the world.

10. Mouse Spider

Named for its underground burrows, not for eating mice, the mouse spider looks scary but isn’t very aggressive. Its bite might cause a headache or numbness.

9. Wolf Spider (Lycosa Tarantula)

This large spider from southern Europe is nocturnal and rarely bites humans. Its venom isn’t very harmful.

8. Brown Widow

With striped legs and bright markings, the brown widow is less toxic than the black widow but can still cause pain and vomiting.

7. White-Tailed Spider

Native to Australia, this spider prefers to hunt other spiders. It hides in shoes or clothes and its bite may lead to nausea and headaches.

6. Southern Black Widow

Recognized by its red hourglass, this spider has a painful bite. It’s more dangerous for the elderly and young children, but deaths are rare.

5. Redback Spider

Also from Australia, the redback uses venom to paralyze prey and liquefy their insides. Its bite is painful and can cause nausea and sweating.

4. Brown Recluse

This shy North American spider bites only when touched. Its venom may lead to vomiting, fever, or in rare cases, destruction of red blood cells.

3. Chilean Recluse

More toxic than its brown cousin, this spider’s bite can damage skin and cause kidney problems. In rare cases, it can be deadly.

2. Brazilian Wandering Spider

Also known as the “banana spider,” it hides in plants and homes. Its venom can cause serious symptoms like breathing problems, and in rare cases, death.

1. Australian Funnel-Web Spider

Topping the list, this spider is extremely venomous and aggressive. It can bite multiple times and its venom acts quickly. Without treatment, its bite can be fatal.

© James Cutmore / Our Media