What is a spider's web made of? Is it a secretion? If so, where is it secreted from? 

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The material used by spiders to build their webs is commonly known as "spider silk." It is a protein-based substance which closely resembles silk thread. It is very strong and elastic, allowing spiders to build flexible yet sturdy webs for catching smaller insects.

The spider silk is extruded from specialized glands at the base of the abdomen- not the anus, as is often mistaken. These glands are called spinneret glands. Spiders produce different kinds of silk, and may have multiple kinds of glands depending on the species and the purpose of the silk. The spider silk is a secretion, but one which the spider has control over.

The various kinds of spider silk may be more sticky (for catching prey) or have varying tensile strength depending on what part of the web it is used to build. Female spiders also produce a special type of silk for wrapping eggs into a protective cocoon.

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