Jumping Spiders See the World in Close-Up
Many spiders catch food in webs and wait for it to arrive. Jumping spiders do not. They hunt in the open, like tiny cats, and they rely on very good eyes.
A jumping spider has eight eyes. Two big ones face straight forward, and they work a bit like the lenses of a camera. These eyes can see small details sharply, which is rare for such a small animal. The other six eyes are smaller, and they are good at noticing movement from the sides and from behind. When something moves, the spider turns to look at it with its big eyes.
When a jumping spider spots an insect, it does not rush. It creeps closer, slowly, keeping low and still when it needs to. When it is near enough, it crouches and leaps. Many of these spiders can jump many times their own body length.
The spider has a safety trick. As it walks, it lets out a fine line of silk behind it, called a dragline. If the spider jumps and misses, or if it falls, the dragline helps catch it so it can climb back up.
A jumping spider is small enough to sit on a fingertip, yet it is a careful and clever hunter.