Cocoon nonwoven bonding structure (A) Bonding between fibres (Bombyx mori) Scale bar: 10 μm (B) Multi layer cocoon outer layers (Bombyx mori) Scale bar: 200 μm (C) Multilayer cocoon inner layers (Bombyx mori) Scale bar: 200 μm (D) Multi layer cocoon outer layers (Opodiphthera eucalypti) Scale bar: 200 μm (E) Multi layer cocoon inner layers (Opodiphthera eucalypti) Scale bar: 200 μm (F) Single layer cocoon morphology (Actias luna) Scale bar: 200 μm.