Spider webs have existed for at least 100 million years, as witnessed in a rare find of Early Cretaceous amber from Sussex, southern England.Insects can get trapped in spider webs, providing nutrition to the spider; however, not all spiders build webs to catch prey, and some do not build webs at all. `Spider web` is typically used to refer to a web that is apparently still in use i.e. clean, whereas `cobweb` refers to abandoned i.e. dusty webs. However, `cobweb` is used to describe the tangled three-dimensional web of some spiders of the Theridiidae family. While this large family is also known as the tangle-web spiders, cobweb spiders and comb-footed spiders, they actually have a huge range of web architectures.
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