The animals represented by countless ties are silkworms. Because silkworms can spin silk, they are inextricably linked to form cocoons. 1. Silkworm is the larva of silkworm moth and the main source of silk material. 2. Silkworms are divided into two categories, one is silkworm, which eats mulberry leaves. The other is the mountain silkworm, which is raised in the mountains and eats leaves. It takes more than fifty days for a silkworm to pass its eggs, ants, mature silkworms, cocoons and moths. 4. Ant silkworm: A silkworm just hatched from an egg, like a black ant, is called ant silkworm. Ant silkworms have fine hair and start eating mulberry leaves 40 minutes after hatching. 5. Silkworms slowly turn white after eating mulberry leaves, begin to peel off and enter the dormant period. After peeling for four times, the larvae became fifth instar larvae, and after eating mulberry leaves for 8 days, they became mature silkworms and began to spin silk. It takes 2 days and 2 nights for 6.5 instar larvae to cocoon. Cocoon silk can reach 1.5m long. 7. The silkworm molts for the last time in the cocoon and becomes a pupa. In about ten days, they will turn into silkworm moths and emerge from their cocoons. 8. After mating, the female and male silkworm moths laid about 500 eggs and died. Such an inextricable connection is silkworm.