Arachnids have four pairs of jointed legs, two body sections and simple eyes. Arachnids are aggressive predators and include spiders, scorpions, mites and ticks.

The Ultimate Spider Quiz

Is it all those legs, or the way they seem to dangle in mid-air, that makes spiders so frightening? People run screaming from them, even though most spiders are not dangerous at all to humans. Take this quiz to learn more about these silk-spinning, insect-eating creatures.

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  • 10 Amazing, Beautiful, TERRIFYING Spiders

    10 Amazing, Beautiful, TERRIFYING Spiders

    Spiders have been on Earth a whole lot longer than we have — 380 million years, to be precise — and number more than 38,000 separate species worldwide. Explore 10 of the most beautiful and scary of these arachnids. See more »

  • How Chiggers Work

    How Chiggers Work

    Chiggers are tiny arachnids that are known for delivering bites that itch intensely. Find out how chiggers work and learn about the chigger reproduction cycle. See more »

  • How long can scorpions live without food or water?

    How long can scorpions live without food or water?

    Scorpions have been around for 450 million years. But the species hasn't been sustained by a healthy, vibrant diet: This opportunistic eater would rather wait for food to come to it than go out hunting for it. So how many meals does that amount to? See more »

  • How Spiders Work

    How Spiders Work

    Love 'em or hate 'em, you've got to admit that spiders are some pretty impressive animals. Movies like "Arachnophobia", "Spider-Man" and "Eight Legged Freaks" even spin their stories around spiders. Check out the real-life web-slinging, wall-crawling, venom-injecting inspiration. See more »

  • How Ticks Work

    How Ticks Work

    Ticks are parasites that feed on the blood of their hosts -- human or otherwise -- and are known for carrying diseases. Learn all about ticks, including how to remove them. See more »

  • What are chiggers and how do they bite?

    What are chiggers and how do they bite?

    If you have ever been out in the woods or an open field in spring, summer or fall, you may have gotten chiggers around your waistband or on your ankles. They leave red, itchy bumps on your skin. Learn more about these arachnids. See more »

  • What is a spider's silk made of?

    What is a spider's silk made of?

    Spider silk is five times stronger than steel and twice as strong as bullet-proof Kevlar. What exactly is spider silk, what is it made of and why is it so strong? Find out the answers to these questions and learn other facts about spider silk. See more »

  • What's the world's deadliest spider?

    What's the world's deadliest spider?

    If looks could kill, bristly tarantulas would be the spiders to watch out for. But violins and hourglasses are far more cause for concern. See more »

  • Arachnids


    Arachnid is a general name for any animal that belongs to the class Arachnida. Arachnids include spiders, scorpions, harvestmen (or daddy longlegs), mites is and ticks. See more »

  • Chigger


    Chigger, the larva of a harvest mite. Chiggers are sometimes called redbugs, because they are red in color, or jiggers. See more »

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