Silkworm Cocoon (IMAGE) St. John's College, University of Cambridge Caption The silkworm spins a silk cocoon around itself for protection during metamorphosis. Researchers have found that silk can protect other precious cargos. Credit Credit: 2017 Natural Materials Group Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.