Types of silk worm

Six thousand years ago, the ancient ancestors of modern man, discovering the secrets of nature, paid attention to the fact that some butterfly worms weave cocoons from thin, delicate, shiny threads. Such a cocoon is like a house for a worm, which first turns into a mushroom and then a butterfly inside this house. Many insects also make nests similar to cocoons, but these nests are made of clay, leaves, and other materials rather than string. Silkworms differ from other worms in that they spin their cocoons from the silk they produce.