Why do silkworms bind themselves? At that time, to get through the pain.

That's just the growth process of silkworms. Silkworms spin silk because they will die if they don't spit it out. Mature silkworms will turn into pupae when they spit out light silk. After 7 days, the pupa will become a moth, and the moth will live for a few days before it dies. Mature silkworms that don't spin silk finally die without molting. The silk in its body will poison the silkworm instead. Silkworms have been eating mulberry leaves from ants to 5 th instars, and silk substances will be produced in their bodies. These silks and themselves will get heavier and heavier, and they will make themselves overweight, so that they can't climb to eat mulberry leaves. 1-3-year-old silkworms will eat on mulberry leaves, 4-5-year-old silkworms will eat from the middle of mulberry leaves, and the unfinished parts in the middle of mulberry leaves will dry up. After eating for 7 days, the 5th instar silkworm began to spin silk, wrapped itself in a cocoon, shed its skin there and became a pupa. Pupa has no ability to protect itself. That cocoon is a protective layer to protect itself from other animals. It has to spit out spider silk. It molts into a pupa, and the pupa molts into a moth. Start breeding the next generation. Just perfunctory from generation to generation.

Cocoon is also a protective cover for silkworms to protect themselves. Cockroaches, ants, spiders, birds and wasps in the wild eat silkworms.