The venom paralyzes or kills their prey. Spiders usually have six fingerlike silk glands called spinnerets located beneath their abdomen. The silk comes from inside the spider's body as a liquid, thicker than water. When a spider wants to make a web, it squeezes the silk out of the two small holes at the back of its body called spinnerets. The moment it hits the air, the silk dries into a line that looks like a long strand of hair.
Many spiders use their sticky silk webs to catch food, which consists of tiny animals.
Some spiders use silk as draglines, which are long lines of silk the spider hangs onto as the wind blows it through the air. Some spiders spin silk webs, and others line their burrows with silk. Many spiders lay their eggs in silken sacs. All young spiders, and some adult males, release long silken threads to float or ride the wind to new areas. This is called ballooning.