consuming large amounts of mulberry leaves The caterpillar moults through four changes of skin silk worm caterpiller
silk worm cocoons The silkworm spins a cocoon for protection, to permit the development of the pupa or chrysalis. The cocoon takes about three days to be fully complete and is a similar size to a peanut shell.
The chrysalis emerges from the cocoon as a moth. In cultivated silk, the grub is terminated while still inside the cocoon so that the long filaments are maintained.