Butterflies in general are fragile, so fragile that the color in them would literally rub off on your hands if you stroked their wings. Butterflies of the species Greta Oto are commonly called clearwings or glasswings and come from Central America. The tissues of their wings look like glass thus giving them the transparent wings. They have dispensed with the growth of colored scales that normally cover the wings of butterflies and moths. Probably a way to hide from predators.