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

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.

Each Year Spiders Eat Millions of Tons of Food More Than Humans

Spiders not only eat more meat than humans every year, they also spend a lot of time getting eaten themselves. See more »

Spiders May Go Extinct From Oversharing

Sharing's generally regarded as a desirable behavior among humans. But for some social spiders, it can be the death of them. See more »

Sometimes Spiders Go Vegetarian, Scientists Find

A new study documents worldwide instances of arachnids turning to plants and vegetation for nutrition and sustenance. See more »

Newly Discovered Trap-Jaw Spider Captures Prey With Astonishing Speed

Researchers had to use special high-speed cameras recording at up to 40,000 fps to even witness the 'lightning speed' chelicerae jaw structures snapping shut. See more »

Tiny Spider Lover Waves Hello When He Wants to Mate

An oar-shaped protrusion of microscopic hairs on the legs of a grain-sized spider is bringing sexy back to the arachnid kingdom. See more »

Shakira's Moves, David Bowie's Haircut Inspire Insect Names

Publicity ploy or not, many surprising folks have insects named after them. See more »

The Four Most Terrifying Words: Enormous Communal Spider Webs

A million spiders cooperating to spin a web the size of a parking lot? It’s not just a B-movie plot; it’s happening right now. See more »

10 Myths About Spiders

We think we know all about spiders — they spin webs to trap prey; if they bite you, you might die. And if you find one in your house, you should set it free. But what if all these beliefs are a web of lies? See more »

Do we really swallow spiders in our sleep?

Worried about creepy crawlies entering your mouth while you sleep? Relax -- spiders have no interest in being eaten. See more »

Do daddy longlegs really have powerful venom?

With its long legs and goofy way of motoring about, the daddy longlegs generally doesn't top lists of the scariest spiders. But should it? After all, if legends are to be believed, it's one of the most poisonous spiders of all. See more »