The different strategies of cocoon placement have led to different morphologies of cocoons, which are shown in Fig. 5. Cocoons made by Samia canningi and Actias luna attach to the substrate with the sericin flowing along the surface on the substrate. This may increase the bonding area between the fibres ( Fig. 5A and B for comparison of morphologies between attaching surface and the surface which is not attached to the substrate (free surface)). Usually the attaching surface is thinner than the free surface. Some other cocoons have a long silk peduncle for suspending the cocoon from the host, e.g. cocoons produced by S. canningi, Antheraea mylitta). Those peduncles have most of their fibres aligned parallel to the length directions with some fibres interweaving in other directions ( Fig. 5C and E). Sometimes the peduncles are covered by moth hairs or other debris ( Fig. 5D for A. mylitta cocoon). Open cocoons produced by e.g. S. pyri and H. cecropia usually have parallel fibres sticking outwards along the exit, which could be pushed outwards by the silkmoth inside the cocoon ( Fig. 5F).