These are giant silk moths from Africa. South Africa. An adult can measure 10-12 centimetres across its wingspan, and 12-14 centimetres from head to the tip of its elongated 'tail-like' second pair of wings. Its forward wings have a distinctive grey-coloured 'furry' leading edge, giving a very rough surface, presumably for aerodynamic reasons. Apart from the eye-like markings on its wings, the colouring and shape of the wings give the appearance of a piece of foliage, especially the 'tail-like' structures of the rearmost wings which resemble a dried out leaf.