The treads on the outside of the cocoons are rough, while those inside are soft and smooth. The caterpillar makes it cocoons using these strands. The liquid produced later hardens to form fine strands. This caterpillar has special glands secrete liquid silk through its lower lip. Only the caterpillars of silkworm moth known as ‘Bombyx mori’ can do such spinning. Not all caterpillars can spin silk cocoons. Soon, the caterpillars are ready to spin their cocoons. The eggs hatch into caterpillars, which feed on mulberry leaves. About 36,000 to 50,000 eggs are laid, and these are carefully stored at the silkworm farm until they are ready to hatch. Silkworms live for only two or three days after laying eggs.
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