Chances are you’re aware that silk comes from silkworms. They have the word silk in their name, for crying out loud. But did you know that silk ― luxurious, expensive silk ― comes from inside a worm’s mouth?
Yes, that’s right. Silk is produced from a worm’s salivary glands.
Tom Turpin, professor of entomology at Purdue University, explained how it all works to The Huffington Post. “Their glands produce it, it’s extruded out in the salivary gland and when they get ready to pupate, once they are done feeding, then they spin the cocoon,” he said.
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Source:: Huffington Post Green