LYCOS RETRIEVER 
Spiders: Types
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There are many different types of spiders that live all over the Earth in practically every type of habitat. They come in colors including black, brown, white, gray, red, yellow, green, and orange. Most spiders live for about a year, but the tarantula can live for 15 years. Spiders range in size from barely visible to many inches across.
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These belong to the largest family of spiders. All construct the circular, flat, wheel-like web in which they trap flying insects. The very large black and yellow garden spider is a typical example (Fig. 16).
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You ... can use browser identification to prevent access by spiders, which are robots that explore Web server content. Spiders degrade performance if run indiscriminately by intranet users. Netscape's Navigator 4.0 and Microsoft Corp.'s Internet Explorer 4.0 use this type of functionality in their "push" implementations.
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