Featured Article: 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 »
arachnids library
Arachnids have four pairs of jointed legs, two body sections and simple eyes. Arachnids are aggressive predators and include spiders, scorpions, mites and ticks.
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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.
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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?
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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.
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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?
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.
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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.
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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.
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Arachnids
Arachnid, a general name for any animal that belongs to the class Arachnida. Arachnids include spiders, scorpions, harvestmen (or daddy longlegs), mites, and ticks.
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Chigger
Chigger, the larva of a harvest mite. Chiggers are sometimes called redbugs, because they are red in color, or jiggers.
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Daddy Longlegs
Daddy Longlegs, a popular name used in North America for the harvestman and in England for the crane fly.
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Harvestman
Harvestman, or Daddy Longlegs, a small eight-legged animal related to the spiders.
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Horseshoe Crab
Horseshoe Crab, a marine arthropod that lives in shallow water. It is also called king crab and helmet crab.
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Mites and Ticks
Mites and Ticks, a group of invertebrates related to spiders. Mites are 1/64 inch to 1/8 inch (0.4 to 3 mm) in length; ticks are 1/8 inch to 1 1/8 inch (3 to 29 mm) in length.
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Scorpion
Scorpion, an animal related to spiders, mites, and ticks. The scorpion lives in warm, dry regions and in the tropics.
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Spider Facts
Studies have shown that you're never more than ten feet away from a spider, and one estimate puts you as close as three feet. Check out some more spider facts.
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Spiders
Spider, an animal closely related to mites, ticks, and scorpions. There are about 35,000 known species, more than 3,000 of them in the United States.
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