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A cocoon is a covering of silky threads that the larvae of moths and other insects make for themselves before they grow into adults. ... The pupa is the intermediate stage between the larva and adult. A moth makes a cocoon, which is wrapped in a silk covering.
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•The silkworms secretes a very fine filament made of fibroin protein from two glands on its head which solidifies upon exposure to air and becomes silk fibres.
• Through movement of head from side to side in the form of figure of eight, the silkworm completely covers itself forming the cocoon.
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