Spiders were one of the first animals to evolve on land. And over the span of 400 million years of speciation and evolution, they’ve learned some amazing tricks. One of their trademarks? The strong, sticky substance that we call silk—every spider produces it, whether for weaving webs, wrapping prey, or even leaving trails on the ground for potential mates.
But every silk is unique, each with different chemistry and different physical properties. Even a single spider web may use multiple kinds of silk. So how did spiders develop these wondrous fibers?
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