Spider webs combine complex principles of physics and chemistry to create one of the world's most remarkable substances. We explain how.

You are most likely to find purse-web spiders in damp woodlands in temperate and tropical climates. One genera, the Sphodrus spiders, are found in the eastern half of the United States.

It's fascinating to watch. Although webs are the most well-known use for spider silk, not all spiders make webs to catch their prey. In fact, less than half of the 37 spider families in Britain do.

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