The holes of O. eucalypti cocoon are found to be arranged along the supporting twig. The rest of the cocoon wall is a nonwoven structure with low porosity, and the fibres are strongly bonded ( Fig. 6A and B, D and E for comparison of morphologies between cocoon holes and free surface Figure). C. simla and Caligula cachara cocoons have a lattice structure without any nonwoven cocoon wall ( Fig. 6C and F). Fibres with higher diameters up to 100 μm (Table 3) interweave with each other for supporting the cocoon structure. These cocoons can also be found covered by leaves, and the sericin flows along the attaching surface for bonding the cocoons.