Pupae overwinter inside a silken cocoon. The larva spins a cocoon and pupates. When the larva is mature it makes a silken cocoon around itself and pupates. Overwintering occurs as a mature larva within an earth-coated cocoon. Silk is a fibre produced by the silkworm in production of its cocoon. Silk, taken from the cocoon of a silkworm, is a filament. The Luna moth pupates after spinning a silk cocoon, which is thin and single layered. Healthier larvae have greater pupation rates and cocoon weights. Healthy larvae lead to a healthy cocoon crop. It burrows underground and curls up inside a protective cocoon formed by its shed skin. Ancient fishing nets used threads made from leaves, plant stalk and cocoon silk. In his flashback, he awakens inside a slimy cocoon. After hatching from a cocoon, the resulting moths are grey in colour. Nekron kills a Guardian and uses his blood to cause a cocoon to emerge. It is farmed for the silk with which it builds its cocoon.