Silkworms are raised in Japan in order to produce silk. As an extension to life cycles unit, 1st graders are watching silkworms eat, grow and spin silk for their cocoons. Adult moths have been so domesticated, they cannot even fly away. (A contrast to our monarch butterflies that fly all the way to Mexico!) It takes thousands of cocoons to produce enough silk for a dress!
Watch a silkworm's life cycleMaking a cocoon
How silk is made
Making silk