Arachnids
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![jumping sider eyes](https://cdn.mos.cms.futurecdn.net/jpPDEYmtXdq7xFJ5FA7ojV-320-80.jpg)
Jumping Spiders' Unique Vision Revealed
By Joseph Castro last updated
Jumping spiders gauge distances by compared a focused image with a defocused image.
![A close-up image of a jumping spider next to a dew drop.](https://cdn.mos.cms.futurecdn.net/KuvxLfTDgzFyLwXCLrLMc4-320-80.jpg)
Sweet dreams, spidey: Arachnids experience REM sleep, and may even dream
By Jennifer Nalewicki published
Spiders likely sleep and dream like humans do.
![The spider 'necrobot' is used to lift up part of an electrical circuit.](https://cdn.mos.cms.futurecdn.net/UgL53iAyZn2Jt3kVv7pNXM-320-80.gif)
Dead spiders reanimated as creepy 'necrobots'
By Harry Baker published
Researchers have turned dead wolf spiders into machine grippers that can be used to pick up a variety of objects, including other spiders, by blowing air into their lifeless corpses.
![Superior dance moves hint at a male's vigor, athleticism and grace.](https://cdn.mos.cms.futurecdn.net/RKvcrNXXoPLnDTGu46suX9-320-80.jpg)
Male spiders drum out mesmerizing syncopated beats to woo mates
By Stephanie Pappas published
Male spiders that dance to their own beat are more likely to win mates compared to those that stick to a formula, new research finds.
![Goliath birdeater spider on moss.](https://cdn.mos.cms.futurecdn.net/os6u4Qnm6gAciiJiY8PKgj-320-80.jpg)
What is the largest arachnid to ever live?
By Cameron Duke published
What's the largest arachnid ever on Earth? The answer is not so simple, say scientists.
![Mating makes these male spiders jump, but not for joy.](https://cdn.mos.cms.futurecdn.net/8CAzaPtKsbsdBbhYiEpE8B-320-80.gif)
These male spiders use built-in leg catapults to escape sexual cannibalism
By Mindy Weisberger published
Once mating is over, male orb-weavers catapult off the bodies of females to avoid being eaten, moving at a speed that's too fast to glimpse with the naked eye.
![Geckos vigorously shook scorpions after catching them, then gulped them down whole.](https://cdn.mos.cms.futurecdn.net/h7A28xBhMZtiGwjd3TZ8yS-320-80.gif)
'Berserker' geckos slam scorpions into oblivion before eating them, epic new footage shows
By Mindy Weisberger published
Violent head shaking helps normally placid geckos subdue dangerous scorpion prey.
![Social spiders in the species Anelosimus eximius live in colonies that may include hundreds of individuals.](https://cdn.mos.cms.futurecdn.net/CguiCWkxvnXxjjSBfx4G74-320-80.jpg)
Spiders hunt in packs of hundreds to swarm prey
By Cameron Duke published
Pack hunting spiders use web vibrations to coordinate their attacks.
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