All spiders produce venom that is poisonous to their normal prey of insects, mites and other small arthropods. Venom is injected through the hollow fangs to immobilize the prey. Since spiders can only ingest liquids, digestive fluids are either injected or regurgitated into the prey. Spiders produce silk that is secreted as a liquid through the spinnerets and hardens on air contact. Different types and textures of silk may be used to construct snares or webs, egg sacs, draglines and ballooning threads.
Some spiders use web snares to trap prey and all construct a silk sac to deposit eggs.
Many spiders attach draglines of silk to the substrate at intervals wherever they go, appearing to have a silk thread to hang onto when knocked from their perch. Young spiders climb to a high point and release silk strands until the drag from the wind is sufficient to support their weight. Then, they release their hold and sail away, often for considerable distances. Their bodies are covered with shades of brown, black, gray, white, yellow, orange or green. Many have a stripe or pattern the length of the first, and sometimes the second, body segment.