LYCOS RETRIEVER 
Spiders: Webs
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Spiders are predators. They survive by eating other animals such as insects, crustaceans, or even other spiders. Thus when spiders get together it can be potentially life-threatening. But spiders have developed special ways of communicating with each other to avoid cannibalism. Male spiders warn female spiders of their presence by plucking their webs, exchanging chemical signals, tapping the surfaces females are resting on, or producing audible drumming or scrapings. Each species has a specific code, and its use prevents most cannibalism.
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Spiders are arachnids. Their bodies are in two parts, the head and the abdomen. They do not have feelers. Most spiders have eight eyes, but some have six, four or two. Many spiders trap their food in webs. Not all spiders make webs.
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Spiders have silk spinning glands called spinnerets, at the tip of their abdomen, which they use to spin their webs. Spiders spin webs to catch insects to eat. The insects stick to the sticky threads of the web. Spiders don't stick to the web because of oil on their bodies. Not all spiders spin webs. Some spiders track down prey by running after it.
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Spiders differ from insects in several respects. They have four pairs of legs, no antennae, no wings, and only two body regions. The head and thorax are combined and called the cephalothorax. The cephalothorax is attached by a narrow pedicel to an unsegmented abdomen. The abdomen has spinnerets at the posterior end, from which silk for spider webs is spun. By contrast, all adult insects have three pairs of legs, one pair of antennae, and three body regions: head, thorax and segmented abdomen which has no spinnerets.
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Spiders lay eggs within a silken egg sac that is often ball-shaped and either hidden in the web or carried by the female. Spiders may produce several egg sacs, each containing several hundred eggs. One female may produce as many as 3,000 eggs in a series of several sacs over a period of time. Eggs may hatch a few weeks later (or the following spring). Spiders reach adulthood in one year. For a spider to grow, it must shed its skin (molt) usually four to twelve times before maturity.
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Spiders are famous for the intricate webs they weave out of strong strands of protein called silk. All spiders can make silk in their bodies and push it out between special body parts called spinnerets at the end of the spider's abdomen. Webs are a great way to catch a meal, but not all species use webs for that purpose; some use webs like a clothesline to hang their egg sacs or to line their burrow homes. The shape and size of webs ... varies among species: in fact, spiders are grouped taxonomically according to the type of web they make. Here are some examples:
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