The most noticeable feature of this creature is its clear wings. Where most butterflies have thick colored scales, Greta Oto have a thin membrane made up of thousand of nano pillars that alter the refraction index of the wing. This causes a low absorption of visible light and a low scattering of the light absorbed. This combination causes the wing to appear completely transparent.
This feature is a strong mechanism of camouflage. Although humans may see them as elegant and fragile, they remain completely invisible to predators with limited visual senses.